Either way, that person should not be managing anything.

And if it was an honest mistake, they need to come out and apologize both to the IC and to the team that is using the documentation.

I think it says a lot about micromanaging practice broadly. the person assigned for a task should be fully trusted and accountable. the manager could've criticize writing, recommend using LLM, but not interfere. what they've done shows lack of trust and responsibility first.

Many mangers shouldn't be managing anything.