White Version of Grand Armored Gryphon?

Gameplay Quests
1

I have recently started farming the reputation Operation: Shieldwall for the mount Grand Armored Gryphon - Item - World of Warcraft (wowhead.com) which was released in MOP 5.1.

While I was looking up info about this mount I found that there seems to have a white version of Grand Armored Gryphon - Grand Armored Gryphon And Wyvern - Patch 5.1 - YouTube (Start from 1:01).

The one you can get from the vendor once you hit Exalted with the reputation has the blue armor, and I cannot find any furhter info about the white armored Gryphon.

Does anyone know if the white version still obtainable in game or it was only made available during the 5.1 PTR?

2

Probably just a model they added into the game but players can not use.

3

Thanks for the info, I hope they will make this obtainable in furture