The post argues that the income-boosting effect of going to a top college isn't due to the education one receives, but instead is due to the possibility of inclusion in a network of people who are all more likely to find success. In other words the friends you meet at a top college are a much better influence than the friends you meet in the hood, and having a good network of friends is more beneficial to your career than what you learn in the classroom.
Of course if you escaped the ghetto to do well you probably know everything there is to know about how poverty works. Other people's thoughts are just sort of a speedbump on your way to let the truth shine here on hn.