You did not " not share my exact thoughts", you did not even grasp the topic. In the former there is some overlap and some deviation. In the latter there is no overlap.
Communist Party of China. The vanguard party of the chinese proletariat, made up of scientific, revolutionary socialists (commuinists).
That person was a ultraleftist. In other words a person who treats communist theory as religion, not science. Their opinion goes against the one of over 90 million communists of the CPC alone.
These countries never claimed to be communist. They called and call themselves socialist.
All of them Were and are Dictatorship of the Proletariat. Which can be noticed by billionaires getting sentenced to death for real evil shit, instead of going free like in out Dictatorships of the Bourgoisie. I recommend Lenins “State and Revolution” as a easy introduction.
Then you clearly have not understood the argument.
Btw even the CIA stated that the idea of Stalin being some megalomaniac dictator is nonsense. Turns out your entire premise is based on you not getting the topic in the first place.