Is it quite critical? Peer review is not checking homework, it's about the novel contribution presented. Papers will frequently cite related notable experiments or introduce a problem that as a peer reviewer in the field I'm already well familiar with. These paragraphs generate many citations but are the least important part of a peer review.

(People submitting AI slop should still be ostracized of course, if you can't be bothered to read it, why would you think I should)

Fair point. In my mind it is critical because mistakes are common and can only be fixed by a peer. But you are right that we should not miss the forest through the trees and get lost on small details.