Junior and I discussed this at the beginning of the H.S. here in Ohio and Michigan. We both agree that the NFHS got it correct for the wrong reason.
The NFHS POE concerned itself with the position of the Pivot Foot instead of concerning itself with the position of the Non-Pivot Foot. How the Pivot Foot is in contact with the Pitcher's Plate (PP) should not determine whether the F1 has engaged the PP in the Wind-up of the Stretch/Set position, but the position of the Non-Pivot Foot should be the determining factor as to whether the F1 has engaged the PP in the Wind-up of the Stretch/Set position.
Just our humble opinion. As MTD, Jr., would say: Peace! Out!
MTD, Sr.
P.S. Still love the Jimi Hendrix in the playing in the background of the video,
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