I haven’t read it, but it’s probable—going from interviews— that the problem with Gary Lachman’s biography of Colin Wilson is that he believes that there is a leftist occultism or esotericism. Worse, he thinks he detects this in Wilson’s work.
And they’re interested in this sort of thing. But the content is implicitly or actually on the hard right. So they have to play a game where they don’t “see” the politics in all the occult and esoteric stuff.