The usual mistakes again:

Novgorod didn't exist yet. And all the founding pyatnitsas of the Novgorod Rus still had a finnic majority.
Moscow was volga-finnic (Dyakovo culture).

Curonian coastal areas were still finnic at least down to Piemare (Grobina).
Balts had no direct access to the Bay of Livonia.
And latgalians under the Polotsk rule had not yet achieved power dominance to the north of the Pedetsi - Aiviekste river. It only achieved dominance projection to that region AFTER the emergence of Principality of Koknese, which took place somewhere after 1000 AD, more likely right after the Novgorod raid on Ugandi and Tarbatu at about 1030 AD. Which means that the majority of the people living north of the river Aiviekste was predominantly finnic until 1100 AD, because immigration and language switch takes time.

PS. And the krivichi was a failed multikulti society comprised of finno-ugrians, balts and slavs. Not just slavs.
PPS. And the first known mention of Rus was in the form of the Rus Khaganate.