>>281399172
Not banned, but highly censored, so it doesn't get theatrical releases nor simultaneous releases in China, it gets the digital adjustments for the violence, the suggestive content (Mitsuri, Tengen's wives, Daki, etc.) and Tanjiro's earrings later on.

Aniplex likely doesn't see a big return for censoring KnY in mid-production just for the Chinese market in hopes of a theatrical release, but will do so later anyway because at the end of the day China is a big consumer of anime and manga even if very censored sometimes.