Forced by Harvard university? :)
I have no issues believing that number because the Chinese standard of living has been rising substantially as the decades go. That is trivial to confirm.
You're the one who should be more skeptical of anything that comes from the US. As it stands you don't believe anything that comes from China, but believe anything that comes from the US about China.
Sounds like you should start applying more neutral standards to how you process information. The world isn't that black or white.