Thanks for that link!
btw did you ever notice that the NRC always uses the diminuitive ("vliegtuigjes", "little planes") when referring to drones? Of course, in this case it somewhat makes sense, because they are in fact tiny planes.
But they use the word not just for these surveillance drones, but also for referring to attack drones firing missiles and laying waste to villages in war zones. I'm not sure what to make of it, whether it's a bias, in general I consider NRC to be a quality paper. It's just such a very odd way to phrase it, and they're being very consistent about it. But imagine writing about abandoned "landmijntjes", or any other type of weapon/killing machine, in the diminuitive.