For this book, the publisher chose to update in place, adding a lesser edition (but with better formatting and TOC) and didn't bother to even change the description of the book. So, all new purchasers don't get what is being advertised.
Maybe this was accidentally deleted somehow when they were trying to fix something else. They still have the same description, including this book, at their website.
I sent Amazon feedback on this also, so we'll see if anything happens.
Makes me leery of doing updates in the future, though, if things like this happen.