To clarify, Audio DiffMaker works in the audio realm, not the electrical or the electronic one. The end result, while it is easily displayed as well, is also produced in the audio realm. It finds differences between renditions detected by a microphone, a device (in the case of a decent one) several times more sensitive and discriminating that human hearing. But still an accepted analog for it. Listening to the difference, or the absence of one, is the test of whether you can hear it or not.
I think it is well thought out and simple but clever. The possible phobic reaction of people invested in making money or seeking validity in their purchases and preferences is not a refutation of the software. Science, as they say, is not a religion. It is true whether you believe in it or not!