Agreed. Yet I often hear people throw around the term 'statist', but it doesn't form an argument by itself.
I don't have a problem with individuals voluntarily forming a state. If I respect their voluntary statehood, then that would be enough to make me a 'statist'. I.e. respect for voluntarism becomes statism.
Being practical, I think the idea of complete anarchy is interesting and deserving to be tested, but I can't assume that it will work before the code is run and evaluated, so to speak.
If we have a plethora of small jurisdictions competing for capital, entrepreneurs, skills and workers, that would be a perfectly fine voluntarist solution, even though it qualifies as 'statist'.