According to Linus it's free advertising for the AI companies (wowe look at how much code Claude (partially) committed buy le Anthropic now!) and also people don't disclose all their other tools either so this is just an exception which can be removed. And I bet there's going to be a ton of LLM based reviewing on all code that's submitted to double check for potential bugs anyway.

Anyone who is allowed to work in the Linux kernel isn't going to (be allowed to) push random slop.