For years I've been following these two on https://www.youtube.com/@ChinaFactChasers and https://www.youtube.com/@TheChinaShow -- had no idea each has their own channels with additional content.

This dumping of new car inventory as used cars is a practice common today in other parts of the world (including the U.S. as well). This is because the car manufacturers don't want dealers to engage in a price war on new vehicles. So a car gets a few days as a "courtesy car" for their service/repair department and a hundred miles or whatever later, that car can be sold as used or become eligible for being sent to an auction house.