In the counter he showed, the other arm is only used to counter punches. Since the off-side arm of the "attacker" is being used to control an arm, there's no need to control it - it is controlling itself. I'm still not sure the control in that method prevents the counter from the video, since the arms aren't activating anything - they are simply attaching to the opponent. When we look at the throw, getting your center low enough to give you leverage is what will prevent that counter. The arm control is preventing other counters.