Ah, fair enough! This is Engels in Socialism: Utopian and Scientific, one of the best introductions to the philosophical aspects of Marxism in my opinion.

As for your point, public ownership and central planning requires infrastructure to direct production and people/algorithms to fulfil those roles (not getting into Cybernetics at this point as that’s another can of worms). All Communists espouse democratic values, usually in the form of “units” that elect representatives from within themselves to a higher unit, in a ladder approach, with instant recall elections available as a countermeasure. Furthermore, the concepts of Democratic Centralism and the Mass Line are critical for Marxist organizational theory.