Based on PG, the school has only committed to two Ps (one L, one R) in the 2020 class, and lost several to graduation in May. So they probably still want one or two more.
I agree that if my son wants to go to this camp, he needs to try to arrange a call. (Not much time left for that, but he should at least try to have some further email correspondence.) At this point, Jr. is leaning against going. I told him he has to decide today (we'd need to leave town in a few days) and needs to reach out again to the coach if he wants to attend.
I also had the conversation with him (about this school and a few others that sniffed around him a bit in prior months) about being on the bench--or not making the roster--vs. being a bigger fish in a smaller pond. The idea of being able to say he plays D1 still is a big lure for the boy. Understandable, but I don't think it ought to be a factor in the ultimate decision.