a) Bad science.
b) Unsupported claim.
c) Who cares, and why?
As an Ashkenazi Jew with an IQ 3 SD above the mean myself, I focus my attention on that question and have a good grasp of the answer. I also have particular insight into why some Jews have high scores, and how the people who care so much about the average IQs of various populations draw all the wrong conclusions from them because of their ideology. (I would also note that many of those who care so much have lower IQs than a very large fraction of the populations they disparage.)
As an Ashkenazi Jew with an IQ 3 SD above the mean myself, I focus my attention on that question and have a good grasp of the answer. I also have particular insight into why some Jews have high scores, and how the people who care so much about the average IQs of various populations draw all the wrong conclusions from them because of their ideology. (I would also note that many of those who care so much have lower IQs than a very large fraction of the populations they disparage.)