Rick that is a common "sentiment" in some (many?) working circles. Does it work? Not that I have seen. Brandon, I speculate this is less about affection and bond than it is about what the club members expect and want to see from a dog (your dog) being developed for sport
All the things I was told to do with my mastiff to "build" drive to include isolation, were all things I never did with my dutch. In fact, I did a bunch of things people didn't recommend like letting her run with another dog, be free in the yard all day - not kenneled, I worked her while she was changing teeth, and exercised her extensively, etc..
That concept of isolation to build drive is somewhat archaic, and a relatively ridiculous notion in my mind. It's similar to working off the idea that a male prisoner kept from the companionship of a female will develop a drive for sex unparalleled by those free to have sex as they desire.