And since they only accept ambassadors of the breed, this means my instincts were correct and he really is a great dog.
He passed his temperament test with flying colors. As they said, they acted as rude as they could be possibly be in dog culture terms. In essence, trying to provoke him. And he was mellow throughout everything. One of the volunteers even picked him up and held him upside down for a few seconds. I think he was a bit startled but he didn't growl or snap.