There is/was a flight out of Split to Munich at 5:05pm and the duration is just over an hour. IF they made that flight, they could have easily made it to Munich before sundown. I am just putting that out there...
Pictures/Videos in Croatia may or may not have been in real time. If they were, then it's likely they didn't make the flight to Munich. But if they were posted sometime after they were taken, ie, when whoever got home or went to have a meal or rest, then it's possible.