Basically China kept metric altitudes even after RVSM came about because their military requires it. They use 300 meter separation, which comes out to about 980 feet. To comply with ICAO RVSM standards which require 1000 FEET clearance and simultaneously comply with their own requirement of 300 METER separation, they "fudged" the metric / feet conversion and came up with that lovely chart. Hence the note to "fly FEET in Chinese RVSM airspace using the China Meters to Feet conversion table". You look up your cleared metric altitude, find the corresponding feet value, and fly feet. Your metric altimeter may show up to 30M (almost 100 feet) off.
By fudging each metric flight level conversion by 20 or 30 feet, the actual FL has 1000 FEET separation from the next, and the military guys can still fly metric increments of 300.
You will notice that the feet value for metric flight levels on that chart will be 100 feet off of whatever the equivalent level is elsewhere. For instance you cross the border from Korea at FL400. You are told to "climb maintain 11,900 meters". The chart shows that 11,900 M equals 40,100 ft. You select and fly 40,100. The metric reDout will show a touch off. This is normal.
So you will CLIMB 100 feet entering China, and DESCEND 100 feet LEAVING.