Two quick points:
The article was published in 2014 and says the scanners Loren is talking about haven't been used in airports since 2012. Thet were replaced with a different type of scanner the authors haven't been able to test.
Also, as to the alleged superior ability of the metal detectors to detect weapons, it ain't so. Years ago a visiting friend showed me the zytel bayonet he carried in an arm sheath everywhere he went, including on airplanes. The old airport metal detectors were completely unable to detect the thing. The nudie scanners probably would have shown it even along the side of his body and would have shown the sheath. The newer millimeter scanners can also reveal such items, and since they do a sweep the simple trick of exploiting viewing angles won't work.