At the code review stage, we care mostly that the code is good (correct, readable, etc). So if the AI-written code passes muster there, then there's nothing wrong with it being "AI-written" in our eyes.
If you care about AI-written for the sake of preventing AI usage by your developers, then I think it's already impossible to detect and prevent.
It depends on why you care about AI-written code.
At the code review stage, we care mostly that the code is good (correct, readable, etc). So if the AI-written code passes muster there, then there's nothing wrong with it being "AI-written" in our eyes.
If you care about AI-written for the sake of preventing AI usage by your developers, then I think it's already impossible to detect and prevent.