I took a brief look at your second link and found this:

"There's no sensible reason to expect that, because all humans faced nearly identical selective pressures until the invention of agriculture 10,000 years ago, and there hasn't been enough time for much evolution since."

The first part is very, very, very likely wrong, the second part is completely known to be wrong.

He also starts out by committing Lewontin's Fallacy.

In a comment he shows himself to be a Lamarckian:

"Oh, the Ashkenazi intelligence thing. Good childrearing! Generations of educating kids well, because of putting a very high value on education, both because of religious requirements and because of the economic niche they got slotted into by European nobility. If there are a set of alleles Ashkenazim have that the rest of humanity doesn't that are plausibly linked to intelligence, I've never heard of them."

"Anonymous" also has an answer (1 May 2013) that is much better.