Which part of the article says that Jews are over-represented? It says that blacks (and, to a lesser extent, Hispanics) are over-represented, but all it says about Jews is that they were under-represented and that this effect starting fading in the 50s.
I assume you're referring to the Priceonomics blog post, while the comment you replied to was talking about Ron Unz's article in The American Conservative.
In the article from The American Conservative, the claim that Jews are over-represented is rather hard to miss.
