My guess is that this “tiny fraction of low income black American teenagers” are mostly, if not entirely, recruited athletes doing a 13th year to fix grades, SAT scores, and (maybe) study skills.
While folks (of any race) from low income areas can theoretically succeed at elite schools via their own initiative, the education at these low income schools does little or nothing to prepare them for an elite education. This is a very significant handicap that many people underestimate the importance of.
