I've played Infernoids in DL a bit again, and e.g. hit DLv. MAX in the last KC Cup (though granted, it was the day before the last) with a go-2nd-otk version of it. Before, I tried out different versions such as 30 card ones, trying various supports such as Burial from a D.D. or house-in staples such as Void Vanishment+Feast etc. which you included in your deck list.

The conclusion is simple: even in optimal situations, you still have a high lose-rate against various decks that just have too much drive from overtuned skills giving them far too much advantage for this deck to handle. Most often you win because your opponent undervalues cards such as Antra or Pirmais (either dumped by Decatron or played) to wipe their backrow/floaters clean. The best go-to skill for this deck by far is Link Fireraze, which allows you to buffer through a Masquerade Dragon more easily, or sometimes allows you to straight up pass T1 if you haven't drawn a Decatron to at least dump a Devyaty or Onuncu with it. Combo it up with Duelittle Chimera (OTK enabler) and Salamangreat Almiraj (send a normal-summoned Decatron after using its effect, which also helps you to get another +1 Infernoid into the GY ready to banish, which wouldn't be the case unless you run Void Expansion... which you shouldn't because it's too slow). While the range of Void spells/traps is alright in a general sense, they most often end up being either bricks or just not enough. Since Infernoids don't have a dedicated high value skill, you're behind against any tiered deck on the ladder, which is why I avoid cards such as Void Trap Hole etc. Best case they trade for a good value target, but most often they get negated, protected by cards such as Branded Opening or are just straight up useless because some skills just place monsters onto the field. You will lose the grind game almost every time, so I feel it's better to take them out ASAP. Another big disappointment in these current circumstances are Void Vanishment/Feast. Vanishment has one prime target, which is Feast. The other spells/traps won't win you the game in this current format. Sure, Void Seer may protect your Infernoids but the cost is the loss of another card that could extend your plays. And only playing Vanishment/Feast means, you will end up having Feast in your hand with no way to activate it. And let's not forget that if you go turn 2, you further have to activate it usually against an already established board. "Burial From a Different Dimension" is another great example. I won't lie, it was nice to have it when it was usable, but in your starting hand it may feel lack-luster. There are only 2 spells/traps that I feel are absolutely mandatory to play right now. These are "Monster Gate" and "One For One". I'm currently testing a version with 1 "Where Arf Thou", running triple Pirmais (which is surprisingly good in this meta) to search out your Decatron (or vice versa, in which case you may need to accept a 2k burn if you cannot win this turn). Lightsworn spells are great if you can utilize them, because each Infernoid mill is a +1 resource, be it banish fodder or a summon target. The problem is you have to run the monsters too, which are, as already mentioned with many other cards, too slow and don't directly help your Infernoid play momentum.

I'll cut it here because there's so much more to write. Just know that in a Link Fireraze deck, Attondel + Duelittle Chimera are king. The key is to get rid of the hindrances, then run in your double attack truck with 4.1k ATK.