If links are irrelevant, I would hire the best writer to some given competitive niche to make the best content out there for $1k+ and rank #1 overnight,
If it were the case, parasites shouldn't be ranking with the trash, useless content used by spammers,
No one would be bidding for auction domains, building PBNs, paying 4-5 figures for guest posts, etc...
Here's the thing, links & authority are still the #1 factor for SEO,
The only major change is that spammy, unoriginal, and useless (AI or not) content is more likely to get your penalized more easily,
And Google is relying in UX signals as one of the major factors as well, which again, you won't get a good UX with spammy content