Thanks for suggesting an apples to oranges type test to demonstrate the validity of using EW against UAS.The article is perfect example to why the US Military is considered to be a bunch of technological fetishists
Long story short, if they think they are ready to take on an amassed attack of a crapload of cheap drones with EW, they should put that EW system in the middle of a weapons range, attack it with a couple dozen of good old Tomahawks(serving as target drones in this case) and see what happens. Spoiler: nothing good, because the problem at large cannot be solved through simple procurement. This is not possible in principle.
Since you do not seem to think EW efforts (by the US at least) would work, despite the article being quite light on specifics and EW being a subject that the operators of sometimes get twitchy about details, how would you recommend dealing with the en masse deployment of low cost UAV swarms against targets?