Couldn't one verify that this malware is present with some kind of listening device...or a dog ;-)? The article didn't mention that the sound theory was verifi

Couldn't one verify that this malware is present with some kind of listening device...or a dog ;-)? The article didn't mention that the sound theory was verified with some kind of external measurement, but I assume it must have been at some point? I'd like to see what that would look like.