You’re taking it too literally, it’s not saying don’t be useful, it’s saying don’t make yourself a bottleneck. It’s a very common failure mode for new engineers turned manager, leading to a frustrated team that feels micro-managed and the perception from leadership that you don’t have your shit together and can’t adequately handle the scope you’ve been given.

Your interpretation does not fit the text. You are talking about someone who is micromanaging. But he's not saying "don't micromanage" in that section.