The video link is more than likely Meathead's Google presentation. He draws some information based on basic science and the way heat energy works. His points make sense, but so does the success of so many people using the beer can method. Hard to argue both sides...it's like fat up, or fat down which he also covers in that speech.
He discusses using a can of beer and covering it with a cold chicken, wjich only acts to insulate the beer from the heat (I personally think that the beer would be affected from heat from below, so insulation isn't a big factor). In his discussion he says the beer never gets hot enough to impart moisture in the bird, because the chicken will be cooked before that happens. If I was to do this method again, I would probably preheat the can of beer to the point of steaming
I don't know if he's right or wrong, don't really care. It is a method of cooking that has to have some realm of legitimacy because its been around for years.