This goes into a similar instructional video I saw as well. And yes, I originally got this from the http://perfectgolfswingreview.net Web site. Sometimes this is referred to as the "pump it drill" or the "6/100 drill."
(Credit: Michelle Dube over at http://www.progolflesson.com/ --- her work is superb)
I am actually working on this myself. I try to feel like there's a rope that connects from my LEFT ankle to my right elbow and I'm tugging my right elbow into position with my left ankle. I just started to try this and it has been cold out, but once I get it recorded and analyze it, I'll post on how I think it works.