It depends. Generally speaking, yes. He will live up to his name and start Blabing about things because he feels "passionate" about things, or because he's "optimistic" about things being better
There are cases where he'll give a short answer because he wants to be funny, or to his credit, even he realizes that he can't stretch everything into a paragraph.

And then there are times when it's obvious he WANTS to say something, but realizes that doing so would get him in trouble

No "It looks interesting, maybe I'll check it out later", and no "It looks stupid. Horror movies are stupid, I'm so cool, etc"
He knows he can get away being an asshole about Adventure Time because it was made by a heartless, soulless studio, so he can claim to be "smart" or "different" about not liking it big name slop, and people would support him. He knows he can't get away with pissing on something that spearheads anti-Hollywood agenda that was also touched by Markiplier.
Oh, also...

Makes you wonder what he would say if he didn't have the "ALL AI IS BAD" excuse...