I'm not prepared to defend this but that's the view - if you have a system of governance it isn't anarchy so if the argument is "all systems of governance are at least partially involuntary" then that may be true but doesn't say anything related to anarchy
Is it? Can you just leave North Korea if you please?
It's even worse if you look at history. For example, US routinely denied passports to "communist sympathizers" until 1960s (https://en.wikipedia.org/wiki/Kent_v._Dulles).
If you take "involuntary" to mean "faced with consequences for one's actions within a group", then maybe it is involuntary, but that's not how the word is used with relation to anarchism as I've seen it.
This is just a private dispute resolution system, not too dissimilar from what can be offered by private companies on clearnet (think eBay).
That's a description of our statist status quo :)
Seems pretty anarchist to me.