AI review can’t properly review AI code.
If you think of it like filters, a human programmer does everything they know and test to avoid bugs, then the AI review catches some things that slip through to catch a larger total number of bugs. But if both sides are AI the same stuff slips through both stages and blows up on production. It makes more sense to just improve the models to make less mistakes than to have AI review itself.
The quick solution is to escalate the arms race, and start using AI to filter the AI slop, but I'm not sure that's a world I want to work in :)