I don’t really think you’ve captured communism: Cuba isn’t.
Communism has never yet been achieved, as any communist government will tell you. Socialism is a transitionary step toward communism. You can’t go to bed in a capitalist state and magically wake up to a classless, stateless society.
China has been moving away from communism for decades.
If you think that then you have not been paying attention to what’s been happening in China for the last decade.