So if the runner sees the throw coming in and knows it will be there at the same time she is, its perfectly ok to just lower her shoulder and blast the catcher? Or maybe that means when the catcher goes to apply the tag in the same situation, it means its ok to whack the runner in the chops with the glove right? That rule pretty much says anything goes and is fair game if the ball and runner arrive at the same time.
the video you posted does not show any lowering of the shoulder or the catcher getting blasted. In fact it looked to me that at the last second the runner tried to avoid the contact and slid, on her feet to the back edge of the plate.
Its a physical game our dds play, sometimes there is contact that causes an injury. But not every time is there a clear cut violation of the rules. Sliding isn't required, some umps/coaches/parents think it is, and there lies the confusion. Too many people with too many versions of what is necessary.