I don't believe particular intelligence is required to understand his posts. He has opinions like any intelligent person has. He just exhibits the kind of attitude that he "knows" everything he hasn't explained, or actually, the unexplained is self-evident and only a moron would ask about it.
In short, he uses shame to silence the opposition before there even is one. Some fall for the trick and take the unexplained as a sign of great intelligence.
He is a tireless with his insults as well as arguments, which is why he enjoys some popularity. Most people would never have the stamina to stall an intelligent exchange of ideas to the extent he does. This is great for those who happen to share his initial views of subjects and don't wish for discussion to advance.
Yeah and he might sometimes argue in an enlightening manner, too, but I wouldn't know.