Sweet mercy. Because the threads in Bug Report and GD aren’t enough about this thing?
As has been said several times over. The table of loot that may or may not appear is a large one. It could very well be that RNG is not being kind to those going nuts in trying to get their hands on this mount. You guys are asking essentially for a game hint, so you may not receive any more definitive word than what was said the last time people were all up in arms in misreading what a GM had said when the mount was also being made available through the unclaimed containers.
Past that, there is never a guarantee of when X is going to be up in the BMAH rotation. It will be there when it will be there. Perhaps it won’t be there for another six months or so, we have no idea. The harsh response is that it was available for the entirety of an expansion, whether you played or not during that time is moot. Now, it is available when it’s up on the BMAH, but they don’t have to have it up just because folks are up in arms. It will be up when it’s up, or they could decide tomorrow to remove it from the loot table there as well. That is their right, and life will somehow continue to go on.