We weren’t told it was limited time tho until someone datamined it. Then a blue was like “yeah thats gonna happen” and everyone was like “UMMM?? WHY DIDNT YOU TELL US?”
https://us.forums.blizzard.com/en/wow/t/looks-like-the-mighty-caravan-brutosaur-might-be-unobtainable-in-901/370236