This is microwave generated EMP. Such can be quite directional and will toast the semiconductors in the circuitry controlling the drone.
It is not EMP, it clearly states it is HEL.
And so, the makers of drones will begin hardening the drones to EMP and other microwave energy through the use of shielding, which likely have been incorporated within state developed drones (i.e. China, Russia, etc). In designing circuitry for complex electronics, it is electrical engineering 101 to provide for the proper shielding one would expect in the environment in which the circuit is supposed to be exposed. A longer term approach might be to cause the sensors within such a drone to be “blinded” to navigation. GPS jamming, RF jamming techniques, IR and laser scattering/jamming. It’s going to be a long slog in developing electronic jamming/counter-jamming for these drones, for many years to come. Directed energy would certainly be an arrow in the quiver of a variety of systems that will need to be developed/fielded.