Including things in the PTR and game files that are not present is an age old tradition at Blizzard. The Emerald Dream and Hellfire were in the game files in extremely early development form for ages. As were never released battlegrounds and crazy spells.
@tweetsrdumb Players have also datamined a lot of stuff in 5.2 that isn't going to be in 5.2 either. Shrug.- Greg Street (@Ghostcrawler) January 6, 2013
Patches tend to get things that don't make much sense to us when we're looking at them from the outside in. On Blizzard's end they must make some sense, although it does seem the amount of seemingly useless data (for lack of a better phrase) has decreased over the last few years. But then again, how do we know it's useless? We don't.
Bottom line, a good reminder from top to bottom that you shouldn't read into datamined stuff very much.