I find that article funny and probably true. The vast majority of dog owners don't have a clue about dogs and get them for all the wrong reasons. Never mind selecting for temperament when the problem begins by selecting the wrong breed. Someone buys a rottweiler because they think it's cute and expect it to be a perfect pet. I'd say in most cases the mismatch occurs almost instantly when the puppy starts eliminating in the house and later starts jumping up on people and doesn't come when called which leaves the owners at a disappointed loss. Puppy temperament tests are for people who invest their time and effort to educate themselves about dogs in order to get something good in life. I'd say those people are a small minority. Taking this into consideration the results of the study are not surprising but should not be taken as gospel by those who are serious about dog ownership. Puppy temperament tests work and if you follow through with raising the pup properly you'll get a dog that's pretty damn close to what you had in mind. This I apply to traditional working dogs. I don't know enough about how temperament tests in molosser puppies turn out.