If the team or technology is new then old metrics will not produce as reliable an estimate but they will still be infinitely better than guesswork. Then ask them to record real metrics for the project as it progresses and adjust their planning estimates in line with these figures. In IT, past performance is a reliable indicator of future performance. You can't believe someone you can't understand, and you can't understand that person if they are speaking a different language. Don't ever assume that the ability to speak in jargon means that the presenter knows what they are talking about.
Understanding is needed to make a decision.
Conclusion These are all reasonable questions, and you have a right to expect reasonable answers. If your team can not answer any of the questions, make them go and find the answer. Amber You should consider breaking the project into smaller pieces, strengthening the team or reviewing more frequently Over 16 Red Stop.