It isn't close to, it is the no true Scotsman fallacy.

Communism (from Latin communis, 'common, universal') is a sociopolitical, philosophical, and economic ideology within the socialist movement, whose goal is the creation of a communist society, a socioeconomic order centered on common ownership of the means of production, distribution, and exchange that allocates products to everyone in society based on need. A communist society would entail the absence of private property and social classes, and ultimately money and the state (or nation state).

Communists often seek a voluntary state of self-governance but disagree on the means to this end. This reflects a distinction between a libertarian socialist approach of communization, revolutionary spontaneity, and workers' self-management, and an authoritarian socialist, vanguardist, or party-driven approach under a socialist state, which is eventually expected to wither away.

their end goal is state capitalism though, so I don't see the contradiction

It's only a fallacy when used wrong