I don’t think there’s any political correctness there. Logically it has to be factual that there is creativity, intelligence and ability across all communities in America, and not just in Belmont. Thus, limiting yourself to only Belmont, limits yourself.
If the author was shooting for something politically correct then he would have said something about race, or women or homosexuals. He made clear, however, that he was talking about whites in both Belmont and Fishtown. That’s not politically correct.
No question there is creativity outside of Belmont. What he seems to be suggesting, however, is that the folks of Belmont will want to send their kids to school in Fishtown so that they can experience the diversity of our culture. But even Obama sends his kids to an elite private school, so Murray is dreaming if he thinks that’s going to happen.