Some people know the systems of certain schools. They know what the applications should look like, know what the admissions offices look like, know how to puff up some assets and downplay some holes in the applications. It looks like he ‘knows’ tech schools, and they do tend to be expensive as those you have listed are private schools.
He’s a volunteer and may not want to spend his time learning about new schools. You don’t HAVE to use his services, so why are you trying to discuss other schools with him?