If I am understanding it right, the maintainer wants human-readable, human-maintainable code even if it is slower than the AI output. As someone who has to maintain someone else's "clever" code, I have to agree with him.
I disagree that the AI can't make human readable/maintainable code if prompted properly, but yeah, just throwing the Claude output up on a PR isn't valuable.
And there are specific "low impact" easy issues that they want humans to solve, so they can get experience and become better devs.
Having the AI do all the easy grunt work removes that ability.