README.md was written by me, and I, of course, used claude/codex for it. In general, I do everything through claude/codex, the reasons are described in https://github.com/pg83/solo/blob/main/CONTRIBUTING.md . And no, it's not low effort, and no, I don't see the point in wasting time de-claude-ifying the text just to avoid it looking like I didn't spend enough time on it.
I believe usually when someone complains about text written by a language model they are hoping to read human-written text instead of human-laundered LLM output.
You make it clear why you write all your code through a llm. But a README is not code. Presumably you would like people to read it. A machine authored readme reflects poorly on a project.