I think that is the problem in some of this debate, that the limited knowledge most of us have with the specifics of the Bradley program. He endorses a specific way in hitting the speedball. I don’t believe it is hit with the traditional boxers style. I understand that it uses more swaying and activation on the hips and lower body. With this in mind it could be endorsed as an all over body exercise.
Not sure if this vid does it full justice though.