If the code is obvious crap, it doesn't matter if AI was involved. If the code is perfectly obviously fine, it doesn't (directly) matter if AI was involved.
In the grey area in between, if someone doesn't say AI was involved it might mean AI was used undisclosed to vibe code the result from beginning to end. If someone said AI was involved, it might mean AI was used solely to speed up testing to track down the cause of the bug. In the former case, you'll get nothing useful out of the submitter; in the latter case the submitter can engage usefully in pushback on their proposed flawed fix. In neither case did the AI disclosure (or lack thereof) actually help.
And that's more or less where this news comes from - the tool usage disclosure turned out to not be useful, partly due to the vagueness of the method of disclosure (a tag in the commit message), partly due to people not reliably following the requirement, so they decided to stop requiring it.
I'm not going to start using AI voluntarily any time soon, but I'm also not going to start panicking that the kernel is suddenly completely turned into vibe coded AI slop like so many crazy people seem to have been doing lately.