Should never be a pen for me. The only unnatural position for an arm to be when playing football and moving is flat down by your sides.
But the law is a mess and under the current guise its the correct decision…. Needs to change tho imo
He blocked a shot on goal with an outstretched arm above his body. Doesn't matter how natural that is or how close to the ball he was, whether he meant it etc. It is a stonewall penalty. No different to a mistimed tackle that brings a player down in the box, it illicitly stops a chance on goal, penalty.