The PCA is a joke that gives these countries essentially unlimited ability to continually move their own goalposts for "peak carbon", no real difficult sacrifices required for them until after they've reached that moving target.
China has been infamous for decades for not even having reliable currency data, what on earth makes us think they're even collecting (let alone honestly sharing) reliable data on CO2, let alone HFCs and CFCs, beyond willful naïvety, irrational optimism, and quasi-religious climate dogma demanding ideological conformance?
The harsh reality nobody on the political left in the west has the courage to acknowledge that climate change is 100% out of the control of our WEIRD (wealthy, educated, industrialized, rich, democratic) countries, and no amount of self flagellation over "climate racism", nor vicious hostility towards "climate change deniers", nor radical proposals to destroy the entire energy grid is going to make even a proverbial "drop in the bucket" difference in climate change. Climate dogma is the TSA to climate change's terrorism - wasteful, ineffective theatrical performance art that degrades everyone's quality of life while doing effectively nothing to address the actual problem, intended strictly to appease the neuroticism of the shmucks dumb enough to believe it makes a difference.
I get that this sounds pessimistic, cynical, and even a little misanthropic, but it's also what the actual data is telling us.
This isn't a fight we can win with the way things are done in China not changing. Totalitarian demands for ideological conformance present an impenetrable barrier for "real" progression of humanity in virtually every aspect in every country where they are practiced, including the climate change cult itself in the US.