He writes exactly like the negative examples in Elements of Style, that is to say he's got a cocky, smarmy voice that he thinks is way more clever and entertaining than it really is.
I'm impressed he managed to actually frame it with his whole soul searching "Who is Russell Greer?" thing, but yeah. Now that you mention it, the book has such a bizarre pace, I dont know if it happened over the course of days or weeks or years. It reads like a fever dream. There's absolutely nothing about where the story takes place or anyone else in it.