There are ways to organize a system of labor that have not been explored or are in the infancy of being considered in the world. Many countries are engaging with more and more socialist ideals every day and they are doing so under current forms of democracy. The world is not binary, everything is a sliding scale with tradeoffs
I'm not sure what in-between there is for "a lot of communist and socialist countries are just as if not more authoritarian than their capitalist counterparts"
The point being made is that the criticism being made doesn't apply to capitalism in any way that it wouldn't also apply to other economic systems.