Not mentioned here that I noticed in the fairly quick scan I made, is a dominant theme from college coaches over the past decade - that HS kids are spending too much time playing AAU games and not enough time actually getting quality coaching with their HS team. The more AAU events and especially one during a HS scholastic year, is time HS kids are not spending with their HS team. I imagine that is a significant reason behind this move from a lot of college coaches. With some players reportedly focusing exclusively on their AAU team, this 'boycott' may be even more pointed.
The other issue I have is that the evaluation criteria that Hansen describes at a HS game, while obviously having some merit, is a very short sighted one. Most coaches and very particularly the best ones, are evaluating the person when they watch a HS game, and not their specific skills which they have already determined are worthy of being recruited - can they shoot, do they have a good handle, are they an active and intelligent rebounder, etc.