Fake news. Not the news itself but the ranking. These rankings are based on input from Chinese universities and we all know of the fudging and faking of Chinese institutions by now- well documented.
Here is a prime example of where they submit the highest number scientific papers /peer review BUT the fact remains they are no1 in the world in faking them. They fake them in such high numbers that they are more than all the fake reviews worldwide
Fraud scandals sap China's dream of becoming a science superpower