Which probably means it's Chinese dollar-denominated debt, perhaps stuff like Evergrande bonds that you could get for $0.05 on the dollar. So, it is "backed", perhaps, in that there are dollar denominated assets.
But, functionally, it's probably not backed in a way that does anyone any good. So your basic point is correct. At some point, people rush for the exits, and when they do, BTC may collapse with it.