What praxeological precept(s) confirm anarchism over minarchism in providing for societal economic health AND societal security from external threats?

This is a mistake he makes which can be fixed by understanding economic calculation. There is no way of measuring the profitability of war, since it’s function is forced coercively. When coercion is applied the measurement of profit in an economic sense is meaningless.

However it’s typically safe to assume that it is not profitable, and destruction is can generally be regarded as a type of capital consumption, the opposite of capital accumulation. In other words it causes poverty.

This is most clearly outlined in the broken window fallacy.

I also explained a little bit about economic calculation here.