I believe that the balls were in compliance with NFL rules, right up until the time that someone on the sideline let the air out of them...
“right up until the time that someone on the sideline let the air out of them...”
And how, on the sidelines would they have let exactly 2 psi out of eleven balls? Don’t get me wrong, it could be done. But you’d have to have a special made apparatus to pull it off. You would have to use an inflation needle attached to a pressure chamber of the right volume for the temperature on the field.