China despite the changes remains a communist country as the means of production are still under the State control. On the other hand, the inequality that exists in China prohibit us from saying that China is a communist success
We can find healthy competition in communist societies for example in finding a better job or in the arts, the difference is that there is no exploitation of man by man.
Capitalism and antagonistic systems have made people greedy and unhealthy competitive although this is not part of their nature.
This argument makes communism non-falsifiable so it is invalid . Actual implementation will always vary. Otherwise, capitalists can claim the same , that the problems of capitalism are due to its incorrect implementation .