Their solution to brain drain from foreign educated students in the 90s was in fact to send even more students to the States.
It’s actually worked very well for them as now they have a huge number coming back after studying abroad. And as our immigration policy becomes more restrictive, China will be getting even more of their best and brightest right back.
From a quick web search, these seem to be more about foreign nationals being detained in China for political reasons or to compel compliance. Not great, but also not really relevant to what I thought we were talking about (ie. Chinese businesses having to make concessions to the government in order to operate).