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What makes this a specifically anti drone technology? Surely the electronic warfare community has been able to do directed EM pulses for long time, what stops it from being a generalized anti aircraft tool?

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Range, I guess

There were a few vaporware corps that proposed ionizing atmosphere with an ultraviolet laser and then sending high voltage RF down that channel. It was supposed to be against cars but I imagine non-rad-hard electronics would find some induced currents troublesome.

Laser induced plasma channel and then zzzt zzzzt lightning ;)

That's where aluminum 'chemtrails' come into play, to create HE radio channels. https://geopolitics.co/2015/04/03/chemtrail-pilot-blows-the-...

Agreed. Seems like a lot easier way to kill a missile than using another missile.

It's easy to defend against.

Put all your electronics in a copper box, and all in/out wires through optoisolators, and you've made your missile EM-proof.

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