Some things mentioned about Nucleous in the stream is that while he's themed around Nucleon, the mineral he's modeled after is quartz. It was also seemingly insinuated that Nucleous and the other Armorizers are all "sparkless bots" with a hole in their chests to illustrate that, suggesting that they may not actually be sapient individuals.
Well sparks are soul analogues not brain analogues so it would suggest more that they are not Primus-Born Transformers but there's no reason they couldn't be Sentient or Sapient.
-ZacWilliam, Humans ain't got Sparks either.