I must say, I applaud your willingness to prove my points for me. Yes, the fact that she's specifically mentioning black students suggests that the black students were more likely to pool at the bottom of her class. Otherwise, where would the angst come from?
I didn't say anywhere that she sees black students at the top because I don't have any information to support that. Georgetown has students of all "races" and its unclear how they break down academically. The link you provided doesn't show that. She's simply noting the correlation between race and performance in her class. And that obviously makes her unhappy.
But the only meaningful question as far as I'm concerned is "why does that correlation exist?" How can we best help those students succeed? Do you have a problem with that position? Do you think firing her for noticing the correlation helps those students?