They’re literally financed by the EU, via NLnet grants. They aren’t CCP agents, they’re just communists, who tend to have a more nuanced view of china because they’ve actually read the history and theory of the chinese state.
There are tons of commies who have major issues with modern china, though idk if the lemmy devs are in that camp or totally onboard with dengism/modern chinese policy, but typically their (communists’) issues aren’t as surface level as “but tiananmen square! uyghur genocide!”. because they see those issues as being 99% used as western propaganda and heavily distorted.