Actually, no. It was seemingly the change in approach that resulted in the T20 World Cup success. Langer was allegedly told to keep at a distance from the team, and was absent from the training sessions. The change in morale was plain to see, and although I respect Khawaja and Head for coming to Langer's defence, they were notably absent from those two tours.
Khawaja basically showed in the TEST doco on Amazon what Langer's flaws were as well back in 2018 when he told him everyone was on eggshells.