On to the technical point, LLM output is output, the source is the prompt, if you are going to commit something, commit the prompt. Second, code that is generated by LLMs is less maintainable, Linus entered late into the fad and anyone with 1 month of fiddling with AI knows that he will regret it soon, it's hard to undo once you corrupt your repo with slop, perhaps if it happens fast enough and there's no major releases it can be swept under the rug.
On to the nuanced point, Linux is purposefully designed to maximize user contributions, so accepting LLM contributions might well serve the particular purpose of linux, but I still think it's technically wrong to commit target code, only source code should be committed, and that's prompts.
But git itself is collapsing, it doesn't seem to be well suited for this new revolution, it doesn't track prompts, or it does so at the expense of the generated code. Maybe github can track target code as artifacts.
I think we are watching the collapse of Linux, Git and Linus. Certainly a bold position, so I don't blame you for being more conservative, but we can come back in a couple of months and see if we changed our minds.