You're making demands (like you would to an llm) instead of asking questions (like you would to a human). The GP didn't even offer to answer questions

He explicitly asked for feedback

Exactly. “Tell me more about X” is an open ended question, not feedback.

You're absolutely right — "tell me more about X" is phrased as an imperative, not a question. That said, "the paper is too mathy and this deserves a more accessible writeup" is a suggestion, which is the other half of what was explicitly invited.