Not sure what his credentials are.. but I can tell you he seems to follow (or get caught up to speed in a hurry) bb players from HS through NBA as much as anyone here. Just be careful to sift through the heapings of hyperbole and astonishing absolutes and he's got some good info.
The best sources on here (that seem to have sincerely watched kids the longest and know what they're seeing) are, in order;
PKM
Vermin
Hantlers
PG_AB
Only reason I have him last of those four is sometimes he's just so outlandish that I'm unsure what he is.
Also, there are now FAR more people on here that have started following kids much earlier than they used to.. and catching up quickly... but those are the four that I have seen have years of already doing so.
Recruiting/scouting is a weird niche ane not for everyone. I don't consider it some elite group... but more of a specialist.
More of a Kyle Korver, if u will.