"Finding Jimmy Page" read to me like fan fiction or self-published. The publisher is a small university press, so it probably is close to self-published. I can't imagine Mr. Page being pleased with the subject matter or conjecture on his personal life including an ex-wife - fiction or not.
There was no need for Spitz's book. He and the publisher cashing in on the Zeppelin name and providing nothing new. It's nothing more than a fat and shiny package by a big publisher released just before Christmas in an attempt to market to a larger audience than the die hard fans.