I think it is still 'news' to most of the Golf World. I can assure you it was news back in the early '80s, when one well-known instructor -- I won't mention his name but it rhymes with Mallard -- was promoting the idea of "retaining the triangle as long as possible" in the Backstroke. In fact, the Golf World was so enamored with the idea that you could hardly pick up a publication without seeing some famous player with triangle graphics decorating his Address, Start-Up, and Backstroke.
When Homer was reviewing The Triangle Assembly (6-A-1) with our 1982 GSEM class, we discussed this bending of the Right Elbow in Start-Up (Magic of the Right Forearm / 7-3). Obviously, this was quite different than that "other" triangle with its frozen arms well into the Backstroke.
So I asked Homer about it, and this is exactly what he said: