How else would you like me to explain how forward pressure on the outside of someone's forearm moves their arm? If I'm punching him in his face, and his arm is in my line of attack it will be pushed inwards. This by no means says that I am focusing on pushing his arm, my focus is on punching him in the face. His arm getting pushed inward is due to the kinesiology of how the arm moves.
If you say push the arm, I think push the arm. Why blame me?
What you describe sounds exactly like what is shown in the videos on the Cutting Punch thread. Not sure why everyone is avoiding that one...