The Mainland has been executing a certain pattern of totalitarian thought control to eliminate dissent to the rule of the PRC. Systematically disrupting that is absolutely critical to the success of any kind of effort to organize mass protests against the Communist Party. That means, essentially, counter-propaganda to destroy the Communist Party's narrative.
the mainland is terrified.
China's bad debt issues are worse then what America had before subprime, between shadow banking, years of bad debt growing international debt that alone means their in for a major recession.
Then the next issue, Mexican labor is now less expensive and more skilled then chinese labor is right now, and mexico doesn't have all of the related transportation costs so the price is actually even lower then that. Add Nafta as a factor and all of those chinese jobs are going to move to mexico just based on economics....it gets worse.
Their surrounded by hostle island clusters that can destroy any attempt to get their navy out, in order to get their fuel they have to sail their ships past these island clusters, go to the middle east pick a side in a centuries old knife fight between shia and sunni and then sail home. Not a problem when america garenteed safe shipping for everyone kind of a problem now that we care less and less about doing that.
Then there is the fact that the american chinese trade war is finally happening and the only market capable of obsorbing chinese goods other then america is the EU and their far more protectionist then america is.
On top of this they have a rapidly aging population and have to take care of said eldars.
Yeah china is in for some seriously bad times and they know it hence the lock down on everything.