I'm gonna go ahead and blow the bullcrap whistle on this one. Happiness may have an effect on a person's physical features, but happiness is NOT related to monetary wealth. AT ALL.
At least not in a scientific way.
"We all ride upon the waves of life, towards the expanse of death, through the nature of beauty. So ride, ride hard, ride towards death with a victory unconquerable. Lash out away from life as does the wind in a sail. Ride on, ride on, into the ceasing of the darkness! Ride into the shelter, seek justice in the beauty, seek power in the life."
I can't see it, but If I was in a room with someone for an hour or two I'd likely be able to guess class. I went from upper class to lower class, and a lot of the movements are actually different. It doesn't surprise me that they found that in this video, but I don't like the way that they reasoned & justified it.