The character of Moldbug (which I don't even know if it is actually what the author truly believes, it was always designed as a pen name) is a neo-reactionary. Ex: He is definitely a racist, with the belief of genetic differences in attitude that contributed to slavery. [1]

Now, I don't like those beliefs at all. I do think that LC made the right decision though. Inclusiveness is a good policy, and no matter how certain more authoritarianly inclined progressives are spinning this, that's what this is. Assuming no one is threatened, and he isn't promoting his politics, he should have a chance of going through the (anonymized!) entry process and talking about the really weird and awesome Urbit.

[1] http://unqualified-reservations.blogspot.fr/2009/07/why-carl...

edit: One of my main philosophical issues with Moldbug (besides the repugnancy), is that he is internally inconsistent. He might refute that later on. I dunno, he's spewed out literally tens of thousands of pages of text.