There are racial differences with pretty much everything in the US. Are benefits for poor people racist because they disproportionally help black people? Is having a required entrance average for universities racist because black people have statistically lower grades/graduation rates? Sure, if you are choosing to filter applicants based on criteria where the only effect of the filtering is changing the racial distribution, it may be racist, but that certainly isn't the case when you are filtering based on whether or not a person has a degree.
I agree to some extent as to how education is a barrier some minorites can't pierce, but those statistics seem pretty reasonable. roughly half of all students (though there seems to be a slightly lower-than-average retention in black males) in general drop out fro various reasons. Maybe the breakdown of reasons reveal some racism, but that isn't something you see at face value.
I think the larger problem causing the social divide is getting in to begin with, as opposed to retention.
1: https://en.wikipedia.org/wiki/Racial_achievement_gap_in_the_...