I agree have never seen it that easy before.
But then again I have never seen that much of a membrane on baby backs either. At least not the ones I get around here. Spare yes but not bb's. I have hit it close a couple times with spares where I get 90% of it in one pull with the paper towel but it looks like this guy hit it just right.
With bb's I try it for a bit and get what I can but after that I usually just wind up scraping the blade of a butter knife back and forth across it which seems to get the majority of the unwanted.