Ok, let me spell this out…
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Marx and Engels created the concept of Communism. They carefully defined it.
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No nation in the history of the world has come close to meeting the criteria/definition of Communism.
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You cannot pick a Communist nation because not one has ever existed. Literally. By definition.
A dictator who lies about their dictatorship is still a dictator, just as a wolf in sheep’s clothing is still a wolf.
https://en.m.wikipedia.org/wiki/No_true_Scotsman
Since communism has proven to be impossible to implement and every attempt has resulted in brutal authoritarian regimes, we can either say communism is an incoherent mess of a utopian ideology which can’t exist, or an ideology that de facto endorses brutal authoritarianism. Dealer’s choice
Other than not understanding how logical fallacies work, you’ve almost got it. Keep at it and I’m sure you’ll get there, eventually.