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I use that type of swing, but it isn't new, Hogan started it
Hardy gets a bit more complicated with all the alligator arm stuff but I get the overall concept. nice you learn to leave the wrists out of your swing, and rotate hard through the ball, you can become much more powerful. Its my key swing though, never stop turning, hence why I have gone to heavier shafts.
PA, the face being slightly closed at parallel is ops thing, I still use the old fashioned method, toe points upwards. The theory is with Hardy and others is that you can keep the toe closed as long as you want, and for that matter you can swing as hard as you want with the arms coming down, that doesn't matter either, but thats where I part company with his theories.