I'm not defending this BS article but that is one of the points that the author is making. The max effective range of handguns against armed perps is about 25 yards. BTW, I work for a class 3 dealer that has way more powerful weapons than our local LE departments.
The max effective range of handguns in the hands of 95% of city cops, or anyone else who doesn't enjoy shooting and practice often, is maybe 25 feet.
The answer to ineffective handguns in the hands of the incompetent is better training, not handing those same incompetent people AR-15s so they can miss more dangerously and often.