Hi,
You find the answer in our FAQ here
The simple answer is that China does not offer any public data for such airports, and therefore, the data provider can´t add it to their data.
Here is the official airport list from the AIP China (AIRAC 2510):
AIP China Index of Aerodromes AD1.3.pdf (567.5 KB)
Sorry, this is country-specific and has nothing to do with us or the data provider.
Cheers,
Richard