100%. Ya can't lock arms with the keeper under any circumstance. There's no such thing as how hard or how long did someone hold the keeper. That's a foul in every other major league and in the CL. Not sure what all this "bullshit" as you rightfully call it is about. Arsenal are making a living at it. If we were on the other side of that play there's no way the goal stands.As long as he is holding his arm while the ball is in play it's a foul, no matter if he lets go quick or not. you just can't do this to goalkeepers on set pieces. used to be that you couldnt even touch keepers in corners, then you could just do this "standing your ground" bullshit. now apparently you can just hold them! awful rule change and is the #1 reason why the league is looking so turgid and full of shit set piece routines these days
Anyone who ever played knows that hooked arm was enough to affect Donnarumma's timing. He was late and was left low and reaching.