I'm ambivalent about the impact of AI on society with respect to Sashiko, but that is the weak argument to make against AI code review.

The strong argument to make is that AI code review sucks. It does a bad job. It denies there are bugs that you have personally verified exists, questions the reason for the patch existing based on this denial, and then demands you create a giant scaffolding of tests to prove to the AI that the bug exists and that your patch will fix it. It is rude to do that to someone contributing their free time to help your project. And yes, I have forked one project as a result of this already.

AI code review will atomize your community with great speed. Beware.