I’m saying that tankies claim to be communists but spend all day parroting their favorite Russian or Chinese state propaganda because they believe everything else is clearly controlled by Obamna™ himself. They rarely actually talk about communism, they just roam Lemmy all day calling everybody who disagrees with them a liberal :D

What you are seeing is one aspect of people, and moreover the ones with "favorite state propaganda" that distrust all western sources as liberal propaganda don't exist. Even just seeing people debating endlessly on Lemmy.ml is just one aspect, people frequently have different accounts or discuss Communism on different threads than the ones they get into debates in.

With respect to China, I encourage you to look into processes like Whole Process People's Democracy, State Owned Enterprises, and other aspects to see how Socialism with Chinese Characteristics works. I encourage you to read the article I linked, as well. Additionally, while I know you said you are an Anarchist, your point on centralization being a bad thing goes directly against Marxist understanding. I recommend the article Why Public Property?

Additionally, I encourage you to look beyond the western veil. There are plenty of Russia-critical sources and China-critical sources in the east.

Capitalism concentrates itself and centralizes, which prepares the productive forces for the mechanisms required to centerally plan them after folding them into the Public Sector. Central Planning is the only way to truly democratize production in the eyes of Marxists.