Looks like the Hachette war has spilled into Audible as well, the audiobook version doesn't list Audible either.
Side note: The bottom of the page has a few interesting choice quotes: For example: ""Think 10X, not 10%. Global scale is available to just about everyone. But too many people are stuck in the old, limited mindset."
Sounds like they're describing a certain rival who only owns a fragment of the mobile OS space.