More like real-world regimes that call themselves "communist" to further their propaganda.
And it's not quite fair to say that attempts to create communism in the real-world will always result in authoritarianism. True communism has happened at various points in history, even now.
The bottom line is: communism is, by definition, the equality of power and resources. Authoritarianism is, by definition, an inequality of power. Thus, an authoritarian society cannot truly be communist.