A lot of the time, it's the editors or publishers who give a book a different title than the author wanted because they think it'll sell better. I've had that happen to me a couple of times myself, though at least I've been consulted in selecting a new title. But I've heard of cases where authors were saddled with more sensationalist or misleading titles than they wanted, especially in nonfiction.
I mentioned that in my post. If that was the case, you think it'd be something he'd mention when bitching about people being drawn to this for salacious content.