The good news is the internet is relatively good at routing around the shit, for now. And I guess de-facto that is something you could apply to your content inputs: what's the pagerank for this content? actual pagerank, not the advertising/engagement bullshit that the search model has turned into. If the AI generated stuff is correct enough that it has a high pagerank, maybe it's correct enough to be used as an input.
but the thing is honestly there's already been an uptick in ML or AI-generated content that is already surfacing in searches and other places and it's not always correct... and honestly the relevance of google's search results has been noticeably decaying for 10+ years now. Things I know are out there and are relevant are not being surfaced anymore. Is AI generation contributing to that problem? Maybe. Probably not helping, at least.