Every definition of voluntaryism is ultimately founded upon ISO (individual self-ownership) and by extension property. This is basic, elementary, libertarianism/voluntaryism. It matters not if “Wikipedia” specifically states it or not. Logic and concrete reality dictate it. Without self-ownership (the foundation of property) voluntary interaction cannot occur, as it takes free, self-owners to be able to voluntarily choose any action.
An opinion about a rock being an apple pie would be equally irrelevant.
The position that all human interaction should be voluntary requires ISO, otherwise—clearly—voluntary can have no meaning.
Kokesh’s campaign is incompatible with this, and thus, is not Voluntaryist by the common and accepted definition. Nor is such an interpretation of “voluntary” logically feasible as ISO is required for voluntary interaction to even occur.
Saying an apple is a fruit and a rock is not, is not claiming a monopoly on the concept of “apple” anymore than saying “a circle is round” is an “opinion” or “interpretation.”