@sue vetements - Have you ever seen a C-RAM operate effectively against multiple rockets and mortars? They aren’t exactly a small swarm in formation! The drones in formation in the video was a test of the ammunition’s effectiveness to take down several drones with a single round. The Rheinmetall is designed to do that and deal with many more drones than shown in that demonstration video.
You can see the type of airbrust ammunition they are developing for this specific purpose here:
Sadly, swarming drones are some of the Koolaid/Snake Oil that the idiot called Williamson swallowed when he was a dismal Secretary of State for Defence. The swarming drones are going to need to be highly capable (read expensive) and so all the toy quadcopter developments and trials that we see from uniformed personnel that fly their pride and joy with military insignia/roundel on it, that spout that there will be no aircrew required in the future, are sadly deluded - like Captain Smith in his unsinkable ship called Titanic.