Having placed second in the Tour doesn't change that.
If Rogla would be second at the Tour and any other mentioned cyclist would win Giro-Vuelta double. It would be a done deal for that other cyclist. So in my opinion no special reason for not to recognize the same thing when it comes to Rogla. Generally speaking.
On top of that lets not forget on how rare a double is. JV being in such position with two cyclists. That is on why historically speaking no other team has achieve what JV might achieve this year. A triple GT crown.