YouTube's argument is the same as Linus' from LTT: if you watch a video without ads, you're failing to comply with your side of the transaction, thus essentially pirating that content and stealing the revenue source.
Regardless if we agree or not with that statement, I'll absolutely side with adblockers always for a deeper issue: it's my screen, so I get the ultimate say on what content gets rendered. Quite literally. It's my network, my cable, my screen, my graphics card, my web browser running JavaScript on my CPU - you do not, ever, get to overreach and decide what pixels show up or not. If I don't want your obnoxious ad for an AI girlfriend to show up, there's no moral argument to be had here.
EDIT: I think some of you are missing the point of this comment. There's no reason to reply to me countering the argument in the first paragraph, as it is not my comment, in fact, I specifically mentioned how it's YouTube (and Linus') argument.