Did u see the pick? Mack was nowhere near ?in the backfield ?.
I thought it was a heads up play by Mack. He realized he wasn't making it to the QB, recognized the screen, stepped back from the defender and made the play.
Yes it was with the backup QB who telegraphed it more, would Rodgers have made that throw? Probably not.
But honestly I don't think "most defenders" are aware enough to make that play.