"To test such situations, he uses a detector that tells him the frequency of things like security systems to make sure they’re operating on a different frequency than his device. If the frequency is a match, he asks to go around."
Also, the statistical power of these results are quite strong. (Sometimes I think people screw up in teaching the "scientific method" as the traditional presentation tends to assume that you are dealing with some effect where you don't have a lot of statistical power, so people get this idea that you must have massive samples and do complicated statistics. This is not true. There are time you are justified in drawing strong conclusions from very small sets of data, because the statistical power is sufficient to justify it. You know this, because you do it all the time.)
And finally, this absolutely conforms with all current understandings of mainstream science and engineering. Massive amounts of engineering effort in the radio world are spent preventing, dealing with, and in some military type applications, causing radio interference. We're not talking about claims that UFOs are giving this guy Parkinson's, we're talking about perfectly sensible straightforward theories that were by far the dominant theory that an informed person would think of even before the overwhelming evidence that it is EM based.