TL;DR Asians are "the new Jews" and are discriminated (often implicitly) - for example they ace at high-school STEM competitions, yet they don't make that many undergrads as they should (with a notable exception of Caltech).
Did you read the analysis? I mean, the length of his critique should already tip you off, since Unz's article takes at least 2-3 hours to read. Gelman only criticizes Unz's assertion that Jews are overrepresented.
Gelman says in that critique that he agrees there is an underrepresentation of Asians.
That's not actually Gelman's analysis. He's just relaying some criticisms that were sent to him by Janet Mertz. Ron Unz responds to this, corrects some of his own errors, and shows his claims still hold. Then Gelman (proxying for Mertz) and Unz go back and forth way too many times, using way too many words and almost no data.
The full TL;DR of that article is that Jews are "the new WASPs" (e.g. are over-represented relative to recent performance on measures like STEM competitions) and both Asians and non-Jewish whites are "the new Jews."
The author suggests that top Asian students are being discriminated against (implicitly or explicitly), and it's unclear whether top non-Jewish white students are being discriminated against, or whether they apply in much smaller numbers to the Ivies.
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.
TL;DR Asians are "the new Jews" and are discriminated (often implicitly) - for example they ace at high-school STEM competitions, yet they don't make that many undergrads as they should (with a notable exception of Caltech).