> If anything I find LLM code shortcomings often a bit easier to spot because a lot of the time they're just uneeded dependencies, useless comments, useless replication of logic, etc.

By this logic, it's useful to know whether something was LLM-generated or not because if it was, you can more quickly come to the conclusion that it's LLM weirdness and short-circuit your review there. If it's human code (or if you don't know), then you have to assume there might be a reason for whatever you're looking at, and may spend more time looking into it before coming to the conclusion that it's simple nonsense.

> This is also kind of a moot point either way, because everyone can just trivially hide the fact that they used LLMs if they want to.

Maybe, but this thread's about someone who said "I'd like to be able to review commits and see which were substantially bot-written and which were mostly human," and you asking why. It seems we've uncovered several feasible answers to your question of "why would you want that?"