McKay has a bee in his bonnet re anarcho-capitalists' insistence on referring to themselves as anarchists, that much is obvious. Every reference to ancapism runs something along the lines of "an"cap or "anarcho"-capitalism.
I find this very amusing because 'anarchist' or 'anarchism' are words (articulate mouth-sounds) first and specific concepts second. Ditto 'socialist' and 'socialism' friends. Speaking of socialism...
A Youtuber called axe863 made a video in which he used scientific, mathematical and statistical common-sense to deliver the KO that the Venus Project and Zeitgeist Movement so richly deserved.
If his approach seems weird and unconventional it's because he's not attacking from a tradition neoclassical or Keynesian perspective. Axe863's poison is complexity economics, something a good deal more dangerous to ideas like TVP and TZM. 
Now to a couple of comment threads from below the video that I thought could od with being replicated just in case they get deleted at source!
AstralLuminary1 year ago
Why can't we generalize the consumption patterns of middle-income people in the western world, set our constraints equal to the amount of localized resources, and the rate of resource recovery, derive a population growth model that would be sustainable to said consumption patterns, and derive the necessary quantifiable amount of work required to expend a self-sustaining sy…
A summary of grievances addressed to my 19th Century anarchist chums re their concepts of exploitation and wage slavery.
Inferring something moral (exploitation) from an accounting fact (<100% of revenue in wages) is a non sequitur and runs afoul of the is/ought problem.
The non sequitur arises because in this case the accounting fact doesn't actually imply the moral one. Further steps would be needed to connect these two different facts, whether an LTV or the will of some deity.
For another link describing the is/ought problem, first formulated by David Hume, maybe anarchist econ needs a guillotining.
Avoiding the non-sequitur problem requires a metaphysical theory of value that is invalidated by observable reality and serious contemporary logical inquiry - namely falsification (Karl Popper) & the maths and quantum mechanics behind incompleteness (Kurt Godel) and uncertainty (Werner Heisenberg) respectively.