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Well, I don't think the views were unsubstantiated. But none of it was news to anyone involved in 'dogdom' in the last 60 or more years.
The practices complained of are as old as dog breeding. But the difference is that when people were using the practices originally, they were using them to achieve a dog that was good, or better, for a particular purpose. Careful breeding produced dogs for quite specialised work; working on barges or protecting itinerant tax collectors or for running alongside coaches, for example. The failures were not kept; no dog resulting that couldn't breath properly or went deaf, blind or lame was bred from, and any such trait was bred out.
But later the lunatics took over. Someone would decide that breeds would conform to some standard of appearance. This might produce harmless consequences; for example, the modern, "show" golden retriever is extremely unlikely to be golden; it's white; but often it produced very harmful ones. These were ignored, with confident smugness, by the Kennel Club.