Bull $#!T, the dog is nothing less than a domesticated and selectively bred wolf! They are genetically closer to their ancestors then we are to ours. Close enough that they can successfully interbreed.
The training collars have both tone and shock, which is settable from mild to strong. They are meant to be used along with the owner's input. A Sharp "NO!" when your dog approaches the chickens, and if that doesn't work a sharper one with the shock and she will eventually get the message. It is not inhumane, as the shocks are NOT painful (they are about the same as you would get from a metal door knob after walking across a carpeted room). It startles the dog, it does not hurt it. If they were cruel they would be illegal anyway.
To say that hunting the chickens is instinctual and cannot be trained out of the dog just proves the person is too lazy to make the attempt. Did you know the most commonly though of guard /attack dog, the German Shepard was originally bred to be a herding dog? Without the guard dog training they are actually a very friendly and lovable animals. I know, I've had two.