It's not a red.
The FIFA rules are pretty clear: "The goalkeeper has the same restrictions on handling the ball as any other player outside the penalty area"
So, when a goalkeeper handles the ball outside the penalty area, it's the same as Ronaldo or Chiellini doing it. It is never a direct red card. Should a yellow be given, depends on the situation.A deliberate handball is always a yellow card. This episode yesterday was tricky. Wasn't a deliberate handball, but one can argue that if the keeper released the ball once he got out of the box, maybe Chiesa would have gotten it and found himself in front of an open goal, so it might have been a yellow, I guess.
Not a shocking decision in any case, that's why nobody is mentioning it. Not giving a penalty for the foul on Chiesa was the shocking decision. A 100% penalty, without a single doubt.