"The aforementioned results suggest that consistent movement by a pitcher plays an important role in maintaining accuracy during pitching."w/o having read the article, I read that sentence as something that strengthens ArmWhip's interpretation. If we're talking arm speed in BP vs game, is it really a different motion? Take out the full windup - is the arm circle really going to be any different? The effort / arm speed will be, but the motion / arm circle itself should be nearly identical.
So your definition of movement doesn't include the speed of the movement. Fair enough. But realize if that's the case then the study is irrelevant to the discussion. Because we weren't talking about altering the movement, only the speed of the movement.