Well, what exactly did the AI do?

If Linus said, "fix the kernel" and the LLM generated 1,000 lines of code that he dropped in, saw it was working, and called it a day, then that would be a problem.

If Linux said, "Where is the problem?" and LLM told him and then he fixed it himself, that's not a problem.

I don´t have a problem with LLM even generating code, I have a problem with programmers not understanding their craft and publishing code they don't fully understand.

The problem is that practically you need to take a hard line because how are you supposed whether something is unexamined slop or if it's been fully understood by a human? The only way to be sure a human understood it is to be sure a human wrote it, so blanket generative AI bans make sense.