Do you know how many pitching commits they have already for your son’s class? This can tell you if this is B list recruiting to fill out the staff. If all your son’s other offers are D3 does he want to be a back of the staff pitching recruit for a D1. However, pitchers can change their destiny with one inning of velocity and success.
The coach is probably genuinely interested. But it appears it’s interest to the level of comparing your son with others before deciding who to offer.