Oh yes. I'm very sure that ZoS will change the textures of the towers just because you are oversensitive and probably with intolerance to anything gritty or even remotely gory, so that you can return to being in your safe zone.
The mushrooms are natural flora for Morrowind and especially Vvardenfell, there's nothing even remotely wrong with them growing the towers. It actually provides a nice and gritty, eerie effect. After all, the Telvanni mages are more often than not fairly greedy, evil and even deal with Daedra for immortality as you'll see in this xpac.
This is a mature game, please go elsewhere if such things "disgust" or frighten you. Ta.