A clearer way of saying that is: Given two qualified candidates that are ranked equal, except that one is white and the other black (and assuming both are otherwise unhooked) the white applicant has a far lower chance of admission compared to the black applicant.
Expand that same rationale to all of the Ivies, and this explains why black applicants get into all Ivies far more often than explainable by random chance, compared to white applicants.