Not necessarily. Though I think if it is consistently applied, it ends up undermining the ancap position. After all, property is theft.
Stephan Kinsella already wrote a rebuttal of that way of seeing the NAP, but GC demolished both. Speaking of that bald man, an article needs to be written on Kinsella, too. He's less of a crank in that he doesn't buy conspiracy theories, but he's HHH's lapdog and he's sort of a cultist.