The chances of any of these chinese girls actually being on prep I'd say is about nada.
Lotsa guys, including me, have been fucking Lisa and other high-volume girls for a good while now without issues. We're all tested clean and clean again ongoing. I get that this is an open forum and of course we should all post our experiences, but I kinda thing we should focus on the experiences, not anxiety.
As for which Chinese girls use prep? I'm aware of several that do. Many Chinese girls are diligent about medical care, they have health insurance and go to the doctor on a regular basis. They are here in the USA to make money, so anything that helps them make more money and safely, they are motivated. So it's not Nada. I'm sure it's not 100%, and I wish more would use it, but it's not definitely not Nada.