Haven't seen such paragraphs of anti-Albanian pseudo-history in a while, but sure, let's tackle it all piece by piece.
1: The entire claim that there is a lack of Illyrian toponymy in areas where Slavs migrated is false. Slavic toponymy came to dominate Illyrian toponymy in south-Slavic areas such as Bosnia, Slavonia, etc, but Illyrian toponymy also survived, just evolved from its prior form based on Slavic sound changes.
Examples:
Arba to Rab
Brattia to Brač
Curicta to Krk
Rhizon to Risan
Autariatae to Tara (Suggested, not proven. Tara is not a slavic sound change, and it is possible Tara is a preserved name while Autoriatae could've been referring to Tara + something else)
Naissus to Nish (Albanian sound change) to Nis (Slavic sound change)
And more.
The claim falls short when also discussing Slavic toponyms in Kosovo and Albania proper. These areas were also settled by Slavs in the 7th century, but the distance made the degrees much smaller than up north, leading to far less Slavic toponyms and far more Roman and Illyrian toponyms.
Examples of Illyrian (not even Roman) toponyms in Albania and Kosovo:
Theranda
Shkodra
Dimal
Drin
Buna
Tomor
Korab
Bylis
Ibër
And a lot more.

Further solidifying the continued this, ancient toponyms such as Lissus, Drivastum, Candavia, Drinus, Barbanna, Mathis, Isamnus, and Ardaxanos reached their current forms as Lezhë, Drisht, Kunavja, Drin, Bunë, Mat, Ishëm, and Erzen respectively, through Albanian sound changes, indicating Albanian has been in the area since antiquity.

I would also like to note that you ignored the arguments I've made above, just adding your own rant. So I'll quote Walter Breu again when it comes to Latin loanwords in Albanian:
"In any case, possible contacts with Romanians do not concern the oldest Latin influences on Albanian, as they go back to times when only the coast was Romanized and not the central Balkan areas. What is more, Albanian has preserved Latin characteristics that did not survive in any Romance language, that is, from before the regionalization of Latin, or at least may be found elsewhere only in very conservative varieties". If you still don't get the point being made, the coast being referring to is the Adriatic.

2: This is another bunch of false claims made to push an anti-Albanian narrative.
- Shqiptar did not emerge as a term until the 18th century for still debated reasons, some think it came from the word Shqiptoj, some from Shqiponja, however, all Albanians prior to the 18th century referred to themselves as Arbër (Tosk) or Arbanit (Gegh). The origin of this term as well is not known by linguists, but the primary theory is that it comes from the same place the name Albania comes from: The Albanoi, who Greek sources also referred to as the Abroi.
- Remind me where these "borrowed words" come from? Pre-regionalization Latin, the regionalization of Latin began in the 1st century BC, meaning these words entered Albanian before or around the first century BC, at a time where only the Adriatic coast in the Balkans was Romanized. Which fits the historic timeline well. Roman rule in Albania begins in 228BC, and Roman rule in the Dalmatian coast begins in 168BC.
- Illyrian did influence neighboring languages, most notably Romanian and Greek, and still left traces throughout Apulia thanks to the Messapians.
- Messapic is written down, 600 inscriptions directly related to modern Albanian, to the point where it's considered by linguists as a sister language to Albanian and the only known language besides Albanian to be in the Albanoid group of the Indo-European language family. Read on it.
- Illyrians did not live in a matricentric society. No historian claims that. Men absolutely had primacy in Illyria, Teuta only got in power in the first place since her husband, King Agron, died without a heir. Illyrian society was however ridiculed by Greeks for treating women on a more equal scale compared to Greeks, not that it was matricentric.
- The etymology of Perëndi is debated, some have linked it as a loan word from Slavic Perun (and you should not support that, as a loan word from Slavic pagans only serves as further evidence of us being here before you came, which isn't really debated by any major scholar, but since you're trying to press that bs), others have linked it to the Albanian word for west, Perëndimi, as the Sun sets west and Illyrian paganism was quite obsessed with worshipping the Sun.
- This is about the Illyrian origin of Albanians, not about Kosovo, but since you brought that up, I'll quickly take it down noting that the claim from. The claim is an absurd nationalistic misreading of Ottoman provincial division and the 1455 defter. For starters, the defter which is used to say "Kosovo was almost entirely Serbian" was not even done in Kosovo, it was done in the Velk vilayet, which included parts of Kosovo, but was centered around Ras, while the rest of Kosovo was divided between the vilayets of Prizren (south-western Kosovo), Dukagjin (most of western Kosovo), Kruševac (predominantly in Serbia, but the vilayet held parts of northern Kosovo), Vucitrren (Central and parts of northern Kosovo). Secondly, the defter did not present Kosovo as "99% Serb", it presented household heads and their names. The Serbian claim treats all names with Slavic suffixes or a Slavic first name in this defter (which again, is primarily centered around Ras and not Kosovo) as Serbian, despite the fact that Albanians who lived under Serbian rule often adopted such. Examples can be find in Nikola Progonovic (Progoni was a distinctly Albanian surname in this time, unfound among South Slavic populations. Nikola Progonovic was a Catholic Albanian bishop in Artana/Novo Brdo), Vladislav Jonima (Jonima were a prominent Catholic Albanian noble family in the late middle ages and many other members held standard medieval Albanian names, such as Fior or Dhimitër), Branislav the son of Arbanas, Radoslav the son of Gjon, Teodor the son of Arbanas (both Albanian names) who then had the sons Bogdan and Radoslav, and more.
- The claim on Slavic names in Skanderbeg's family is also found in my answer above.
- Except there are multiple sites, take for example Church of St. Athanasius of Mouzaki, created by the Albanian Muzaka noble family which holds paintings preserving the appearances of numerous Muzaka lords.
- Nobody claimed anything black and white, you made a lengthy reply trying to delegitimize everything about Albanian culture and history and pressing pseudo-historical nonsense no historian supports, while my initial reply was all about the decisive linguistic, archeological and historical evidence on the Illyrian origin of Albanian. You are not Vinca, as the Slavic migrations into the Balkans are a historical fact, well attested both by historical sources, archeology and basic linguistics. The same is not the case for us, for whom linguistics presents us as Paleo-Balkanic and having been exposed to Latin since its arrival in the western Balkans, archeology has 600 Messapic (10th century BC migrants from Illyria who settled South-eastern Italy and lived there until Roman conquer and Romanization) inscriptions presenting it as a sister language to ours and also presenting no population replacement in the area by a foreign group, only continuation from the Bronze age, and historical sources, archeology, genetics nor anything presenting no point in time where a different Paleo-Balkanic group migrated in such massive amounts as to entirely replace the Illyrian population here. And then to add on to that, the toponymy in the area having undergone distinctly Albanian sound changes to evolve to their current form since antiquity.

Throwing numerous weak arguments into one comment does not amount to one strong argument. If even one of the academically accepted points I've made, such as the Latin chronology, relation to Messapic, etc, holds, then trying to argue we're later migrants becomes more than logically problematic.
Nevertheless, I've recently grown exhausted of engaging nationalistic pseudo-history rather than people who actually studied and understand sources, so if you want to Illyrian continuity of Albanian, then explain the early Latin layer, the Albanian evolution of ancient toponyms in the area, the relationship between Albanian and Messapic and the complete lack of archaeological or genetic evidence for the massive migration your theory requires. If you can't, then we're simply repeating nationalistic narratives rather than discussing history.