Author here. Yes, if you don't know the domain, you should have a really good reason for overriding the team.

Asking questions is a way to gather information that you can then share back with the team. If I were new to a team and had a situation like what you describe, I might go back to my team: "Hey all, I was talking with Professor SmartyPants about $PROBLEM and they suggested $APPROACH. It sounded plausible to me, but y'all are the experts here. Is $APPROACH something we've thought about, and can you help me understand the pros and cons?"

The discussion that follows would help me figure out how good folks on my own team are: who considers the idea, who can explain why it's good or bad, who gets huffy when new ideas are brought.

So yes, 100%, be careful with thinking "I asked questions of a lot of people" means "now I'm an expert that should override what my team is telling me"!