Yes, they did:
https://wow.gamepedia.com/G%27Hanir
You are misrepresenting.
It wasn’t someone’s subjective view that G’hanir was the afterlife of the Dragons. Krasus was invited there by Aviana and saw it with his own eyes.
It wasn’t someone’s subjective view that the Emerald Dream was the afterlife of the Wild Gods. Almost every questline on Hyjal is about resurrecting them from the Dream, particularly Cenarius.
https://wow.gamepedia.com/Aviana#Cataclysm
https://wow.gamepedia.com/Malorne#Resurrection
https://wow.gamepedia.com/Goldrinn#Cataclysm
It’s okay if you like these retcons, but pretending they are anything but that is disingenuous on your part.