True.
Also, Murray said during an interview that he would have like to do a more in-depth analysis of the IQs of Jewish people (and especially Ashkenazi Jews). His co-author, Richard J. Herrnstein, was Jewish, and Murray said he didn't know his IQ, but assumed it was "extraordinarily high."
Even today, some in academic condemn claims of Ashkenazi Jewish intelligence with "Scientific Racism."
80% of Jewish immigrants to the USA are Ashkenazi Jews.