Shit code review is not code review. If you just rubber stamp everything or outsource it to someone who will, you aren't doing code review.
Aside from that:
LLM generated code is more likely to have subtle errors that a human would be very unlikely to make in otherwise mundane code.
Citation requested
My current least favorite thing is LLM generated unit tests that don’t actually test what they say they do.
If I had a nickle for every single time I had to explain to someone that their unit test doesn't do anything or that they literally just copied the output and checked against it (and that they are dealing with floating points so that is actually really stupid)... I'd probably go buy some Five Guys for lunch.
Its like saying that the problem is that you are using robots to assemble cybertrucks rather than people. The problem isn't who is super glueing sharp jagged metal together. The problem is that your product is fundamentally shite and should never have reached production in the first place. And you need to REALLY work through your design flows and so forth.