What utter rubbish that he's part of some plot to reinforce 'Jewish superiority'.

I didn't say he was part of that plot.

It's the Jews, Zionists, and their corporate media, among others, that push this idea of Jewish supremacy and Ashkenazi brain power rather than explain all their Nobel Prizes and Academy Awards and Election victories as selective nepotism.

However, according to that article he supports the concept by providing a rational for it...

" MacDonald's most controversial claim is that a suite of traits which he attributes to Jews, including higher-than-average verbal intelligence and ethnocentricism, have culturally evolved to enhance the ability of Jews to out-compete non-Jews for resources. "

That article is largely the same as it was in 2016 when copied from Wikipedia, where the article has changed since. I wonder if you think the 2016 article was erroneous.

Jewish pathologies.

Genetically and/or culturally inherited?