Only an EA could take seriously someone who approvingly cites journals like "Mankind Quarterly" and crackpots like Richard Lynn, Steven Hsu, Jonathan Anomaly, and Emil Kirkegaard.
The author considers himself a "rationalist of the right" and a libertarian who enjoys Richard Hanania and Scott Alexander. He describes ten tenets of right-wing rationalism, 8 of which are simply rephrasings of various ideas promoted by scientific racists. It would be an understatement to say this guy is monomaniacally focused on a single topic.
(Oh, and he publishes his brain farts on Substack. Because of course he does.)
I think in their minds, there is this magical threshold below which all the brown and disabled people live, and once you get rid of all the people residing below that threshold all you have left is smart people who want to make the world better.