Not certain about that in China. All of the procedures that have been designed for RNP are based on WGS84 datum. I will agree that there is little data, and Jepp frequently had the locations incorrect. The new runways such as Lhasa/Lhiza had to be surveyed, and that was WGS84. (SRTM data then ground verified)
As GPS navigation has evolved, so have the standards. The work in the US was problematic as well, even though the the datum and survey standards were good, the standard was to survey the end of the RWY, NOT the threshold. This lead to significant differences in many locations.
KPSP current RW endpoints from FAA:
KBOS:
In AUS, same thing, the datum for the design has used WGS84. Not to say that the locations were correct either, but at least were a little better.
AUS was the same way when I did MEL, and it took a while to move the RWY location to threshold, but now they are all pretty good.
YMML:
Back to the thread, the RWY endpoints and coordinates are constantly surveyed and updated, and verified/validated each cycle. Much the same as the magvar is constantly checked, and rwys renamed accordingly.