a) It has no numbers I can see. It just states that median housing is now about 2.9X median income. It doesnt say what either actually is. This would be helpful to know.
b) It uses a national scene. All Real Estate is local, and I dont think anyone looking to buy their first house in San Diego really cares that they could buy 5X the house in Detroit. Saying national numbers look similar to national numbers in past times that were better; so therefore it must be a good time to buy is just dumb.