That's not a contradiction, that's a qualification. Anarcho-syndicalism is a form of anarchism. Anarchism only means the structures can't be hierarchical system

That's not a contradiction, that's a qualification. Anarcho-syndicalism is a form of anarchism. Anarchism only means the structures can't be hierarchical systems of domination. Even egoism allows for bottom-up organizing. I'd agree that real-world projects like Rojava while ideologically aligned with anarchism can be more accurately described as libertarian socialist or maybe mutualist (or in this case simply democratic confederalism, which it is explicitly is built on) as they're not "pure anarchism", but there's nothing in the basic ideas of anarchism that procludes organizing or the emergence of complex structures. Saying anarchism can't be "organized" just reinforces the stereotype of black clad teenagers throwing rocks at storefront windows, which, while it certainly can be fun and exciting, usually barely qualifies even as "praxis" in any meaningful way and even more rarely is informed by a coherent anarchist philosophy beyond general sentiments.