Interesting theory. Perhaps a little too complex but reasonable to assume that if you return a drive to China, someone will be officially tasked with finding out what’s on it.
i think its more likely some lone worker will snoop into it out of curioristy, than some government sanctioned order to do it. But that goes on everywhere. e.g Take your computer to store where you bought it at to get fixed, and there’ll be that a worker there will look at what porn you downloaded recently