It doesn't exist to put bodies in the seats at United. Aviate is a suckers program to keep qualified pilots from leaving UAX carriers. For example the 40 or so people who entered Aviate at Gojet last year, they kept flying for over a year, while those who didn't get accepted into Aviate left for Frontier, Southwest, Delta, AA, Flexjet and similar. Then Aviate opened up without a selection process, so another hundred Gojet pilots are staying around waiting to flow instead of leaving for AA or Delta. Those who applied to majors outside the flow sat in class before those in Aviate, just at different carriers.

That shouldn't stop the kid from using Aviate if it gets him a scholarship from United. But his fastest path is to keep an open mind and apply everywhere until he gets where he wants to retire. If he put United on a pedestal and will settle for nothing else, his fastest path is Envoy, Piedmont or PSA.