Bullshit. We already know that mixed economies can work well and we already know that centrally planned economies lead to dictatorship due to the incentive alignment problem. We also know that centrally planned economies are incredibly inefficient at distributing goods and services. Communism is just a terrible idea and no amount of magical thinking and idealism can make it a good idea. The only way it works is on a very small scale where everyone personally knows everyone else, and that's not in any way practical in a world of 8 billion people.