All that tells you is that command economies administered by violent revolutionaries are inefficient. It says nothing about all the other possible models for economic organization.

It's entirely plausible to have public ownership of capital while using market signals steering it. We don't need vast fortunes concentrated into a few hands for markets to work and it's not unreasonable to imagine there are other ways to organize an economy than old fashioned command economies or markets. We could imagine using machine learning algorithms for capital allocation for example.

The capitalism versus communism meme strikes me as a failure of imagination. It's like imagining that the world can't work without intellectual property.