NewCultivator from what I recall back then...
China, and a lot of Asia in general, has a much stronger superstition, especially on things such as the afterlife, ghosts etc... The ban was placed on such things because they didn’t want materials which could breed that superstition. This was why the author had to change things to be more scientific.
Side note, their film and tv industry took a heavy hit at the same time as the put a ban on historical dramas, and it was deemed to be disrespecting history 🤨