I fully believe that it have been proven in the MMR that Beatty is beatable. They are simply a Goliath all you need is a brave David. Hit or slam them in the right place and they are stuck. All you have to do it get it just right. They tried to modify their robot to counter that, but the strategy worked a second time. Now don't get me wrong, Beatty is an incredible robot-just not invinceable.