First and most of all, you're assuming that this is a high-tech, difficult to mount operation. While the article does mention a few details in this direction (the speed and flight time, the number of drones), they only suggest that this would be a problem for consumer-level drones, not something that would be difficult for a military or commercial drone.
You're also conflating these reports with unspecified other reports going back 70 years to try to paint a more mysterious picture. This does not follow in any way.