A couple of years ago, he created a Wikipedia page about this book. It was eventually deleted, but Deletionpedia saved it.
Various details are included about the plot and whatnot, but the most interesting section is "Litigation concerning this book." There, he writes:
The manuscript of this book was originally banned from publication by a US District Court whose ruling was affirmed by a US Circuit Court of Appeals. Due to a US Supreme Court ruling, this book was allowed to be published provided it would be "...published as a work of fiction..."
There is no Supreme Court case with that quote. I checked. The Supreme Court and Court of Appeals cases he mentions here simply don't exist. Given that he provides no citations or details as to any of these three cases, there's no reason to believe that any of them ever actually existed.
Similarly, in August 2007, Smith added citations to two supposed Australian newspaper articles about his book. As far as I can tell, neither of those articles are real either.
So to anyone inclined to believe that Smith really possesses secret evidence that supports his claims, remember that he's manufactured and promoted other fake stories in the recent past.