I don't even see the point from GW to insist that Cathay is "clean", i mean it's not like it's the 1st faction to be like this:
>lot of skull or "body horror" tier
Empire
Greenskins
Vampire Counts
Warriors of Chaos
Beastmen
Dark Elves
Skaven
Tomb Kings
Daemons
Chaos Dwarfs
Ogre Kingdoms
>Somehow there is one skeleton unit in the faction tier
Bretonnia
Lizardmen
>No skulls or "body horror " tier
Dwarfs
Wood Elves
High Elves
Kislev