Based on the video, what I see is that the roll over drop is the opposite of the rise ball. Saying there is no such thing as a roll over drop is like saying there is no riseball.
My daughter played in a softball field that has the two pitching rubbers on the pitching circle. One rubber is at 40 feet and the other is at 35 feet. She had a hard time because she kept slipping when she landed on top of the second rubber. Our coach complained to the umpire about this problem...