You can't have capitalism without private property rights.
There is no effort that would make the theory of communism not what it always becomes. You can't be a human without property rights. The entire theory of communism reduces us to disposable animals. No amount of mental gymnastics or dishonest philosophical tricks will change that.
Communism is state ownership of people. That's ultimately all it is. That's the theory. You can dress it up in a million different ways and say the effort just wasn't there to match the theory, but the truth is that the theory is so rotten that it's always going to end the same way.