Here is another story of dinosaur studies and here is the shorthand, popularized translation

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"This indeed proves what can be done through selective breeding, but falls far short of proving what occued in a real-life, "free range" situation. Unfortunately, such breeding often reinforces medical problems, making long term survival success (including the generated adnormalities) in the wild less likely."

Quite so, Ed... but it shows HOW the mechanisms work. By observing both positive AND negative results of breeding, they show in a relatively short time what might have happened if natural selection didn't ...ummmm... select.
The program made the specific point that many of show dogs (about 1 in 4) do have medical issues that would affect their survival. By metaphorically 'playing God', we better understand better how Nature works...

(off to get some shop work done)