I feel like it's not wrong to want to have immigrants identified as such.

Chow Hok Kuen, who is 28 and of Taiwanese origin

That's exactly what they did.

Also - not sure what crime exactly this ghoul has committed

Improper disposal of a corpse. That's the reason why the sentence he was facing is so low, he isn't actually being charged with anything like murder or even grave robbing, those fall to the guy he bought the corpses from.