I think the time is right to do the Vuelta after the Tour. He's had 3 years of riding a single GT, all podiums or wins, and last year there was the Olympics.Agreed. Even though a total number of his race days isn't very high his schedule is very difficult regarding a large temporal spread of his objectives. I don't know if he will be able to keep form during the Vuelta, he may skip it again or target stages due to a form lapse.
Now, with no Olympics or mountainious WC route, it's time to push the boundaries in GTs for Pogacar. Pressure on him to win will be lower if he wins the Tour regardless, and if he doesn't win he might salvage his season somewhat there.