"Militarized handgun, like assault weapon, is an elastic concept which can be stretched to encompass all sorts of guns. Which is perhaps the point."Given the stated goals of the term's originator, I'd say that's exactly the intent.
Remember that GCA's "sporting purposes" clause barred the importation of military surplus bolt-action rifles and double-action revolvers for years, and they only get in now under a C&R exemption.