Communism does not require centralized control of the economy, as it is Stateless

You literally cannot distribute, and coordinate production of goods, to the extent Communism requires, without a centralized economy. You can have a centralized economy and no other state apparatus. I can’t imagine it succeeding, which is one of many reasons I’m not communist, but it is both necessary and theoretically possible. This is communist theory, not mine.

2: syndicalism and communism are economic theories, not systems of government. The system of government you are implying is anarchism. Anarchists are fine (if, in my view, very optimistic in their understanding of how humans work) . The system of government the vast majority of communists want is not anarchism, and I would not ban anarchists, even if they’re communists. The world will never just descend to anarchy, so it’s all a moot discussion anyway. We’ve seen countries slip into authoritarian communism in current generations.