Generally, I think camps this early on are not a wise expenditure. If it were a year or 18 months from now (for a 2020), then a camp can be effective if the goal is to shove yourself under someone's nose and try to close a deal. I would make an exception and go earlier if the player really had his heart set on one particular school and was pulling out all the stops to get an offer from that particular school.
I think you could visit the school (the way any non-athlete would) to see if he likes it AS A SCHOOL. After Sept. 1, he is eligible to take an "unofficial visit," so you can gauge their interest by asking the coaches if they would meet him while you're up there. If they make it an "unofficial visit," you'll get no help with travel expenses, but they could provide the player and his parents with football game tickets. If they do that and they devote time to meeting wtih and talking to him, that would answer your question 100%. You might even leave town with an offer in hand.
He does need to take care not to go to the point of getting an offer unless he's ready to commit. If they offer, they're going to want an answer within a reasonable time frame. And if you act like you want an offer only to sit on it indefinitely while you shop around, you can burn a bridge.
I will say, I was glad to see the follow-up note that the son had taken the initiative of sending his own e-mail. In these communications, the parents may serve as proofreaders or advisors, but it's his job to do this. As for "not being good on the phone" or such, well, as my dad used to say, "You ain't gonna learn any younger." If he's not good at an essential adult skill, the proper approach is not to try to construct a world where he never has to improve. The proper approach is to steel yourself to do it anyway, and to repeat until you do get good at it. Honestly, it's not that hard anyway. He just has to get over the fear of it, same as if he were asking a girl on a date for the first time. (Would you do THAT for him? Of course not.)
One thing coaches want to know is, can this kid survive and thrive at our school? Conversely, if we put money on him, is he going to be overwhelmed and flunk out come the end of his first semester, and never even play for us?
When you realize this, you can see how important it is for him to emerge from his adolescent cocoon and start tackling things in a way that shows everyone he comes into contact with that he is mature and prepared to succeed --not just on the field, but in the classroom and in managing his life when he's several hours away from parental support.
A part of this is that the parent must never, ever, do the work for the player. The parents' involvement is limited to (a) any call upon the family's financial resources, and (b) making sure the player doesn't choose a school that is beneath him academically.