Actually, I think their basic comparison is proper, two "real" rifles, (not clones) made by the actual factories that make them for the military, compared side by side.
It would be nice if they had the rifles zeroed, and shooters who were familiar with them shooting them for the test. An NCO from each countries military, who actually used one for a living, would be a good start.
As for the cost of the clones in respect to their accuracy, from what I've seen, there really isnt a whole lot of difference in the way they shoot. I think the ones that were made up here, tend to be less accurate than those whose receivers were barreled by the country of origin. Kit guns are another issue all together.