That's a dilemma for sure...
The same situation occurs at our HS...our kids aren't high profile like yours, but still, it is aggravating...this is a case of the coach not fully understanding the importance of these statistics for a junior class player. Hopefully the scouts and recruiters who are looking at your son will look beyond this, but in reality some will miss him entirely if his statistics aren't tremendous...and it would be a shame if they aren't tremendous solely because of a well intentioned volunteer is not properly recording them.
Now on the flip-side...
I've read on this website in the Illinois forum about coaches that actually inflate the stats for their star performers...this admittedly helps the player initially in attracting attention to the himself and his coach's program...but ultimately it could backfire if the star can not produce the same results when the books are being kept by others. That's a dilemma too...of their own selfish making!
The proof is in the pudding...the trick is getting the dessert invitation to the right person and hoping they respond by showing up and then enjoying the flavor!