As someone that is enjoying this bug as funny story to tell for past 2 years I dont think they can add it easily or they would so. Probably technology limitation and stuff (it is rendered afterall, I dont think there is anything in game like that that is made rendered from skybox or something from such large distance).
Anyway, there is something else. There is actually 2D picture of the sky with mountain present (something I would have expected them to add). But for some reason it doesnt show most of the time and when it does, its in wrong direction
btw Ald Velothi House don't have visible Red Mountain too.