He's a handsome dog, has a good working pedigree, and is still green. In horse terms, you could call it "green broke"... not a horse you would put a beginner on to ride. He will need more miles and wet blankets before I'd call him "thoroughly trained".
I think the initial "negativity" in this thread was borne out of concern for the OP, making sure he/she didn't get taken advtange of by an unscrupluous dog broker (yes, they are out there). If the dog was represented as "thoroughly trained", well... that's not what the video shows, but a newbie probably wouldn't be able to recognize that. Just wanted to be sure that the OP really is getting what was asked for and expected, in the dog that was just purchased.
I understand the dog needs time to settle but I do not expect to have to re train the dog, that just sounds absurd. He will need a few weeks to get accustomed to my family, certain sounds, our routine, and yes the way I pronounce the commands but I do not in any way believe that I am going to have to be re training the animal.
Not RE-train. Continue training. His obedience is not yet solid, he is still in a learning phase. Taking him to obedience classes would be a good idea, not only will it help you bond with the dog and establish your role as his new leader, but it will sharpen his obedience, and you can teach him new things too. If he's been raised in a kennel, he may not have learned house manners yet.
Having to pull a dog out of a kennel to "test" him for a situation like the OP's is a little disconcerting to me because the OP is likely to not have the knowledge of what to do when he acts totally different in a different situation, as dogs are known for doing!
That is my concern as well, hence the recommendation for training above.