Reasons why not:
1) large number of stickers (more than 50)
2) they did it: 42039 is a (Le Mans) Prototype car
3) it's a lincenced set, and Porsche 991 (not mistyped, it's the factory code of the latest 911) GT3 RS is a new (2016 model year) Porsche model, and the next GT3 RS is far away from prototype status.