Forget “affirmative voice” for a moment, since that seems to be tripping others up as well as you. Prompt Engineering suggest sounding like the LLM, asking questions with “the same voice” as the one the LLM uses to respond. Perhaps PE needs to clarify this with some examples, because calling it “affirmative voice” hasn’t seemed to make it clear enough.

I suggest asking them, then perhaps sharing what you learn for the benefit of other folks who are similarly confused.

The only interpretation that comes to my mind is avoiding “not” and “don’t”. Ask for what you want instead of what you don’t want. 🤷 That’s just a guess.