Moldbug believes that white people are the intellectual superiors of black people. That's supremacy. It's on his blog and in the medium post you linked. He isn't fooling anybody with his explanation of how that belief isn't racist or supremacist.
>>He isn't fooling anybody with ...
What prevents you from taking him at his word about what he believes? Why would you distrust his own explanation of his own opinions? I don't think we're doing civilization any favors by speculating about people's "true" beliefs in order to ostracize them.
Moldbug has said many absurd antidemocratic things, but you don't need to misrepresent them to convey that.
If you want to debate someone seriously, do it like this: http://slatestarcodex.com/2013/10/20/the-anti-reactionary-fa...
but it is the literal definition of racism...
The fact is that when you plot the results of IQ tests, the accepted measurement of intellectual capacity, along with race on a chart, a strong correlation is present. I don't think we should ostracize people who've performed this experiment and noted the results. It's not "racist" to perform this experiment, and it's not racist to acknowledge the widely-repeated results.
People usually say that the correlations demonstrate that the IQ test itself is racist. Maybe that's true. But just plotting race and IQ on the same graph and noting the outcome is not.