"Swarm" is not the right word in this context, and it was not used even in the Russian (stupid) media (but an English interpreter used it).
"Swarm" is typically used while addressing coordinated, interacting and self-organizing crowd of robotic devices. Too loud in this case where we see just wooden made-on-the-knees drones. And a dozen of them can hardly be considered as a "massive attack".
Nevertheless, it is good, military wise, to deal with such stuff for real training of the airbase personnel and identifying optimal measures to take away various models of this flying b-sh@t.