I find this topic extremely interesting, and actually wrote a paper on it for my Sociology of Race and Education class from a similar but slightly different perspective. Although we weren't mentioned, I am a black Caribbean-American who attended an Ivy League school not listed here, and saw the same dynamic on campus. One of my African-American friends even lamented, "Why is every black person on this campus Nigerian or Jamaican?!" Although exaggerated, she had a point. I didn't know statistics, but many black students were either of African or Caribbean descent.
I am the child of immigrants, and I can tell you that the 'wealthy immigrant' assumption the article makes isn't totally grounded in reality. Yes, there were some who came from families with means, but this wasn't everyone. In no way was my family remotely rich, or even middle class. My siblings and I were taught to be self-motivated and value education, which I definitely attribute to my success. Family background does play a huge role. The families of every single one of the friends I had in college valued educational achievement and made it a priority for their children, regardless of race. My ancestors experienced slavery as well in the Caribbean, so I'm not sure how valid the "culture of oppression" argument is,but I do think that ongoing dialogue is important.