I gave my why's already in the previous comment:

Claim: What it will do is it will spoil it for 99% of small time artists that still managed to make a living out of it.

Why: It will drown audience with slop and make them not care for new releases even more.

Claim: That "artists" idea is that the Monet's will survive, but art is not a rat race where just the Monets need apply.

Why: (because) a healthy art scene needs all kinds of creators, at different levels, and needs to be able to sustain a decent above-average quality chunk of them. Not just the Monets.

As for the last claim:

Claim: Not to mention it seems like the pretentious artist in the discussion sees themselves as some outlier Monet type that will be fine.

Here's the why behind that (since I didn't elaborate as I find it self-evident): because he says he's fine with AI, because AI will sweep the art scene from lesser artists and lives the Monets and real artists. Either he claims that he is one of the lesser artists that's OK for AI to sweep away, or he implies that he's one of the good ones that would be fine. The latter sounds far more plausible.