This year, the Feds tightening has further strengthened the dollar, while Beijings easy money policies have further weakened the renminbi increasing the incentive for Chinese investors to dump Chinas currency for dollars. Right now Chinese can earn the same interest rates in the United States for a lot less risk, so the motivation to flee is high, and will grow more intense as the Fed raises rates further.
The whole thing is a house of cards.
Have you read this:
https://wolfstreet.com/2018/08/14/alibabas-20-f-annual-report-financial-comedy-gold/