I think there's some semantics going on here that's debatable. Lenin describes "the state" as a body that exists to oppress one class in the service of another class, whether that be bourgeois against proletariat, or vice versa. Gramsci describes "the state" as a body that mediates conflict between the classes, but almost always favors one class over the other in those meditations, but a good mediator cannot function while totally favoring one side, hence why bourgeois state do often do small things that benefit the working class. Under both these descriptions, full communism would be stateless since class divisions would be abolished.

Now I suppose there is a debate to be had whether in this post-class society we'd still need some sort of administrative apparatus to mediate conflicts between individuals and to regulate anti-social behaviors, and whether that could be called "a state" depending on your definition.