Unless you’re an ultra-orthodox marxist, there is no such thing as trüe communism™.
There always have been many different ideas what „communism“ is, e.g. there have been various „nationalist communist“ ideologies (complicated by the fact that the Russian SFSR called everything „nationalist“ that wasn’t 100% aligned with its ideas of the Soviet Union, e.g. Hungary).
There are also no clear boundaries between communism, socialism, and anarchism, e.g. Kropotkin with his theories of anarchist communism.
That being said, I don’t think communism is a system (either social or economic), it’s strictly an idealogy, meaning it’s a way to achieve something, i.e. the classless and stateless society. If you follow that thought to its logical end, you cannot even „achieve“ communism at all, since at this point e.g. the proletariat ceases to exist, and as a result you cannot have a „dictatorship of the proletariat“.
It’s… complicated.
No, I have a very easy explanation what communism is, it’s just that nobody else agrees is the issue.
Yeah, well… So let’s see, we have: Marxism, Leninism, Trotskyism, Stalinism, Titoism, Gulyáskommunizmus (both, as mentioned before, considered „nationalist communism“ by other communists), Rätekommunismus, Realsozialismus, Maoism …
So, which one of those is the true communism?
Joking aside, most of the 20th century was spent with people killing other people because they had slightly different opinions on what true communism means, so it’s really not me who made things complicated.