[trashtester]

Interesting link. I specifically noticed this part:

And the argument could be made that this is nothing to do with genes but instead a response to handicaps placed on our people since time immemorial by those who want us to fail.

This is interesting, because it's precisely such handicaps that could explain a genetic component to Jewish performance. And the Ashkenazi in particular.

If a population is banned, for hundreds of years, from owning land and working as farmers, that creates a very significant selection pressure for finding other ways to survive. Those not able to do so either died off or converted to Christianity.

And it just happened to be that most other livelihoods available to them required more mental capacity than farming.

Also, as you say, this is at the population level. It's perfectly possible for Jews to have average or below intelligence. It's simply a lot more likely for an Ashkenazi Jew to have an IQ of 160 than for other Europeans (or other Jewish groups).