I agree with a few of the comments....
1) game video is nice, but video from the side or the pitcher (even if it's practice) would be better.....you can show him blocking 6 or 7 pitches...heck, they don't even need to be that hard, but his technique is easier viewed from the front
2) with regard to the blocking....agree that he needs to keep both knees down, but in the video, it appeared that almost every pitch he blocked was to his right...a couple probably could have been blocked with both knees....but I think he did need to slide for a few. Again, video taken from the front will allow you to show each type because you can locate the pitches
3) where was the 1.88 POP recorded. If it was the pitch that you showed in the video, that's not accurate....he wasn't in a game situation catching stance (actually not close) and he was almost on the plate by the time he caught it. No way that can be representative of a game situation pop time. Not being harsh....but any coach who saw the video would immediately notice the same thing.
Other than that...looks good. Good catchers are tough to come by....my son is a pitcher and he throws a completely different game depending on the catcher behind the plate. If he's comfortable with him, he'll throw any pitch in any situation....if not, he limits his pitch selection and it usually doesn't turn out well.
Good luck to your son....there are a ton of guys here who have been thru the recruiting process and are always glad to help