That's because people don't understand the words that they use. Even people that label their countries communist.
'Communist' and 'nation' are mutually exclusive terms. There's no such thing as a communist nation, it's not possible. Communism as originally defined by Marx is lack of a state.
You can start another 100 countries and call them communist but they're really only Leninist (or derivative ideological strains). Guys starting with Lenin took the rather popular idea of statelessness, which is required to completely eliminate the master-slave / lord-serf / employer-employee relationship of capitalist employment, and used that popular economic ideology to create a vanguard state to work towards communism. It was always an attempt, either sincere or not, as a jumpstart towards communism.
I'm not a communist, nor am I a sympathizer. I'm a wholehearted statist in favor of democracy. I do think there are lessons to be learned from Marx's examination of the capitalist economic model, and believe we could have a better hybrid system with workers' cooperatives to compete with capitalist enterprise. I'm just telling the truth on this one, there cannot be a communist nation. It's a complete contradiction. Lenin completely understood the USSR couldn't possibly be both a state and communist, but admitted this, and called it communist anyway. And all of this is why if you read about 1800s communists, they're all referred to as anarchists. Still are, if you're talking to someone that understands communism.
Authoritarianism comes in every flavor of Kool-Aid.