During peer review a race condition was found in his code. Would he have spotted it himself when writing the code manually? Maybe, maybe not. He's only human, and the AI is only AI.
I wonder if humans would have spotted this one if no one knew a LLM wrote it. Obviously it's nearly impossible to test that though.
It's not necessarily a human who found this one. Coding assistants are so widespread that people don't bother mentioning them.
Such LLM defensive positions seems fun to me for some reason.