I saw this explanation a long time ago on reddit, and Im stealing it.
There are two types of communism. The communism in theory and communism as practiced.
Most people talk about communism as practiced. Think the USSR, China, Argentina, Cuba, any “state capitalism” country. This is how any attempt at communism will end. This is due tobthe fact that there isnt a mechanism to go from the tyranny of the proles to true communism, so you get stuck in tyranny.
Youre talking about communism the theory. Communism the theory can not exist. Its fine to discuss it, but saying that communism the theory is the only true communism is just being obtuse and/or disingenuous.