Flight has now been cancelled, 4 hours and 45 minutes ( note, just short of 5 hours) after scheduled departure time, passengers now being deplaned.
Notice how you say PAX deplaned. This would mean they boarded and by doing so the crew would have had to be there.
I can see peoples frustration but working for an airline at another airport I can assure you that any delays/cancellations today on flights using Spanish airspace are genuine. Our AGP was delayed 3 hours and our ALC by four hours. The PMI flights at most UK airports today got away within around an hour of scheduled departure time, most likely because it is easier to re-route this service straight over France without flying into northern Spanish airspace and having to add to much extra fuel that other flights will have needed to re-route.