The problem is that this doesn't work if you don't know the subject matter already. You can't tell the facts from the inevitable hallucinations.
A possible mitigation might be to ask the same question in different phrasings multiple times, and ideally ask different models, to distill the truth that way. But I'm not sure you still save any time, that might actually take longer than just learning the old-fashioned way. Plus you don't learn how to learn, so it's a net negative.