Blizzard tweak lore all the time. Perhaps they felt (if this is legit) that Council of Glades had a snappier sound to it. It sure sounds more undercover and stealthy than "Council of Tirisfal" to me. These are secret guardians of Azeroth we're dealing with, no?
- - - Updated - - -
I'm not saying you're wrong (because I have no idea), but it doesn't have to be fake simply because most are. Let's take a moment to remember how awful the concept of WoD sounded in its leak. People laughed at it, dismissing it because it was so bad.