This couple will never dance well together because they have no embrace. They are focused on their feet. They are learning steps from the instructor that are no part of the social tango scene in Buenos Aires. They are obviously husband and wife trying to improve their dancing, but the instructor isn't giving them what they need. Sad.
Just to mention that the instructor claims on his homepage that he was born in Argentina, has been intimately involved with Tango all his life, is a very experienced Argentine Tango dancer, choreographer and milonguero.