Brutosaur still bugged in 9.1.5

[Teufelgott-shadowsong (Teufelgott)]

Blue answered OP in the CS forum back in August:

Clarification on Brutosaur availability on BMAH

I received word back - When the mount was removed from the vendor, it was added to rotation in the BMAH. The hotfix update on July 14th is intended only to add the mount to the container as well. So now the mount could show up on its own or as loot dropped from the container. At this time, it all appears to be working as intended