Hmm, which geneticist coined the term? Oh, it was VDARE contributor Steve Sailer? The one who writes about black genetic inferiority and Jewish control of the media?
Ah, you're right, Marks clarifies that racists appropriated the term he coined (http://anthropomics2.blogspot.com/2019/12/i-coined-phrase-hu...). Siskind obviously was referring to the nazi/alt-right/nrx meaning of the term, associated with Sailer, though.
Well, Jews are 3x over-represented in US Congress and to a variable degree in other high-effort, high-reward areas such as law and yes, media management.
Unless you'd suspect a conspiracy, there has to be a genetic or a cultural reason for that and the problem with that is that any such reason could plausibly apply to Black Americans.