What if you started with good documentation that you personally wrote, you gave that to the agent, and you verified the tests were appropriate and passed?
I'd extrapolate that the OP's view would be: you've still put in less effort, so your PR is less worthy of his attention than someone who'd done the same without using LLMs.
That's a pretty nice offer from one of the most famous and accomplished free software maintainers in the world. He's promising not to take a short-cut reviewing your PR, in exchange for you not taking a short-cut writing it in the first place.
LLMs can't count letters, their writing is boring, and you can trick them into talking gibberish. That is a long way off the Turing test, even if we were fooled for a couple of weeks in 2022.
IMO when people declare that LLMs "pass" at a particular skill, it's a sign that they don't have the taste or experience to judge that skill themselves. Or - when it's CEOs - they have an interest in devaluing it.
So yes if you're trying to fool an experienced open source maintainer with unrefined LLM-generated code, good luck (especially one who's said he doesn't want that).
Would you like to take the Pepsi challenge? Happy to put random code snippets in front of you and see whether you can accurately determine whether it was written by a human or an LLM.