The USA is a strange place - in 1964 you had blacks and whites legally required to not sit together on buses, and mobs which attacked and beat people who broke this convention and law. And of course slavery before that. It still rules US politics, the airwaves are filled with politicians denouncing DEI, Black Lives Matter (or peripherally ICE raids dragging mestizo immigrants to prison).

It is kind of like the oddness of British prime ministers kneeling to the king and such, but a US anarchronism.

Which is what we see here - people trying to put some sort of scientific veneer to their racism. I don't even know where to start - they seem to think you can boil a brain down to a number and then rank them, in addition to some hand wavy notion that this has nothing to do with education but is 100% genetics (whatever this magical "IQ" number is which boils the billions of neurons in a human brain to one magic number). It is obvious from the outside,from outside the US, but permeates a sheltered, de facto segregated US in the throes of attacking DEI and making America great again like the days of Jim Crow (or even slavery). Obvious to most non-Americans but kind of invisible to upper middle class white Americans who grew up in de facto segregated suburbs.