I suspect (obvious disclaimer, this is speculation, but I've seen this happen many times elsewhere) is that the Teams team (heh) was asked to improve their performance for this sprint and they poked around a little bit to find some of the easiest wins, which is what we're seeing here. At most places, presenting that you've improved launch speed by over 2x is a major success, and their PR team decided it was worth advertising. The people who worked on this should be proud of the work they did but there is still clearly a long way to go to improve the app's performance.