Since the article in the OP is questionable reporting I doubt its to precise.....and if he is actually right its most likely is the Chinese.
That is your opinion only...I don't think the article is questionable at all...Get your facts straight before you state alleged facts...
It is like this. Your kitty weighs 9 pounds. A tiger weighs 500 pounds. A tiger can eat 56 times more liver than your kitty.
Further, two types of incidents are conflated: what seem to be tiger kills and something a little more specific.
The liver is rich in iron and is used in Chinese medicine.
So about half the incidents are some combination of restaurant/anemic/Chinese kills.
If some Chinese are spotted in areas that have the more precise kills I would bet on the Chinese.
That being said liver overkill on big cats causes the same Vitamin A deficiency it does in small cats. Its a fact medically proven.