It doesn't take a champion shooter to rapidly pull a trigger and hit people-size targets within a given range. Some revolvers have 7 rd to 10 rd cylinders, depending on the caliber. And with multiple revolvers, you could fire 12-30 rounds without reloading -- just swap guns. One in the hand ... two in holsters.
Good points but the article did say rifles. I know that revolver rifles do exist but I haven't seen them being reported as being used in crimes before and in general they just aren't that common.
So when it comes to rifles, the alternatives to semi automatic actions are going to pretty much all be much slower shooting. Pump, lever action, bolt action, single shot, etc. are all going to have lower rates of fire and thus, in laymen's terms will be less deadly.