"Anarcho"-communists are not voluntaryists though; they're no anarchists in our conception of non-aggression. Perhaps they may more-easily be convinced of our ideas, but it seems more likely that they're Marxists operating under the guise of anarchism, albeit many are just lost and confused in the literature. I don't always, if ever, see an alliance with them. They propose just the activities of the State: anti-capitalism, democracy, social justice, resource planning, etc.
The "anarcho-communist" view is that if you smash the State then you effectively smash capitalism too. If not, then there is more to anarchism, they'll say, then ending the State: ending hierarchies, sexism, racism, ownership of capital goods, etc. Thus I don't believe they're really anti-statists, even. Sometimes, in fact, such as the AntiFa variety, it seems they're even worse than statist socialists, who at least believe partially in private property, if in name only.