Well, not self-published
yet. The pathology of the self-declared genius just has such a common pattern to the behavior, whether it's writers, inventors, artists, "scientists". There used to be a guy on AOL who claimed that he had built an entirely new understanding of physics from the ground up.
And it loses its potency over time, but
this guy really made a splash in the science fiction world a few years ago with his relentless campaign to win a major award for his craptastic novel.
An interesting common pattern is the belief that their novels hold the power to greater understanding of the world/god/self far beyond whatever moral the story may have. And truth be told, this kind of lunacy occasionally gains traction as with The Celestine Prophecy or The Alchemist, and then the author gains validation for their delusion as a prophet rather than as just a writer.
The fact that this guy is proclaiming himself "the best" whatever means that he's far more interested in creating a following rather than simply selling a book.