I don't think he implied that the _people_ with this knowledge must be overwhelming. I think he means these people's intuition, and knowledge, about radio/signal processing, must be overwhelming (to _them_ first and foremost) during their day to day life.
As in, everywhere you go, you realize how much information a knowledgeable evil actor could extract by simply analyzing what's being irradiated.
I'm imagining something like the brother in Better Call Saul, where it's painful for him to be in the presence of cell phones or fluorescent lights, etc.
Not just the practical considerations of someone extracting the information, but just that studying this and reasoning about it to the extent that you can extract information out implies such a deep understanding of another part of the electromagnetic spectrum.
I would liken it to having the ability to imagine another color. They probably don't have an exact idea of the information flowing around them, but they know it is there and they have an ability to reason about it better than others. I can't imagine that's something that is easy to simply leave at the office.
As in, everywhere you go, you realize how much information a knowledgeable evil actor could extract by simply analyzing what's being irradiated.