Frankly I expect the kernel dudes to be pretty good about this, their style guides alone are quite strick and any funny business in a PR that isn't marked correctly is I think likely a ban from making PRs at all. How it worked beforehand, as already stated by others is the author says "I promise this follows the rules" and that's basically the end of it. Giving an official avenue for generated code is a great way to reduce the negatives of it that'll happen anyway. We know this from decades of real life experience trying to ban things like alcohol or drugs, time after time providing a legal avenue with some rules makes things safer. Why wouldn't we see a similar effect here?