Yes that nymphing technique has been around for over 20 years, myself don't care to use two flys very often, due to all of the snags (sunken logs and trees etc) where I fish. Seems like I am losing more time retying flys on and off with two flys not worth it, losing all that fishing time over the course of a day.

I usually fish with one heavily weighted nymph type fly. Well not all of the time just when I really want to touch some fish.

FL