I’m not defending the recruiting services competence is doing what they’re intending, but I do know that they have explicitly and repeatedly stated that the primary objective of their high school basketball recruiting rankings is to predict a player's long-term professional potential—not how good he will be in college, much less how much he will contribute as a freshman.
The distinction is important because fans frequently interpret recruiting rankings as forecasts of how much immediate help a player will provide their college team. That is not what the rankings are really designed to measure. For example, Jasper Johnson was ranked as a top PG. That was entirely projection – maybe a terrible projection, but a future forecast nonetheless.