I'll try to find the source, from one of his books.
>We estimate that over three quarters of the students who apply for admission to Yale are qualified to do the work here. The great majority of students who are admitted stand out from the rest because a lot of little things, when added up, tip the scale in their favor.
Their applicant pool is so deep that they have their pick of qualified students of every type. They aren't admitting people who can't do the work just to meet some quota.
But let's say your theory is true and that the lower ranks of Yale's graduating classes are full of Black students, why is that a problem? Is getting bad grades at Yale going to damage your life? Are people graduating low in their class from elite universities worse off than people graduating higher in their class from worst universities? Plenty of successful people weren't highly ranked in their graduating class. Getting bad grades at an elite university like Yale seems to almost be a requirement to run for president nowadays. And regardless of the admission policies, some people have to end up being the worst ranked in their graduating class. Why does it matter if it is a Black students or anyone else?
Would I personally pick worst in class at a top uni over middle or best a level lower? Eh, probably.
Either way, it's really not my theory. It's something Thomas Sowell documented in one of his books. Here he is talking about it: "Thomas Sowell: affirmative action creates academic failure & resentment" - https://www.youtube.com/watch?v=VVvnTByzTmA.
Sowell is black, if it matters. https://en.m.wikipedia.org/wiki/Thomas_Sowell.