Work the problem on small recon and suicide drones rather than hoping for a silver bullet solution to defeat them.
Nearly preaching to the TDR choir:
Good camouflage and concealment defeat most of the current civilian drone capability, so a standard of training that would mitigate low and slow flying Fiesler Storch in 1940 would substantially be simple and easy to implement and was routine in the British Army of the Rhine from 1945 to until the early 1990s. As most soldiers know, simple countermeasures can render thermal imagery far less effective than commonly supposed.
Well, there are a lot more drones than there were Storches, I dare say.
Camouflage and concealment works for static units or units stopped and under cover. As long as they aren't too concentrated or obvious lumps across the terrain that justifies some recon by fire.
But what about units on the move? If defense is reliant on being under cover, the war is static.
Mind you, I won't say the author isn't fully appreciative of that. Concealment is simply one passive tactic to defeat small drones. The point that tactics and not just new weapons, passive defenses, and electronic countermeasures can counter drones is useful to keep in mind. Such tactics while on the move are needed, too.
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NOTE: I made the image with Bing.