Yeah, I have heard the demon thing in China but so what?
Lotr had demons and ghosts as well.
I doubt they would change something so important in lore just for China.
THe Demon blood is the reason the orcs can be seen as good in the first place.
Becuase didnt do the invasion and slaughters out of their own volition but were corrupted and were under bloodlust.
With this out of the window, the sympathy factor kinda plummets and I am sure the writers know that.