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“.