Meno – true. I just don’t know anything about any research/sources on the topic, and it’s possible that it’s true. Of course, then it could also apply to much Jewish music (which the writer might have been including in the term “goyish music”). Loud music has definitely been shown to be bad for one’s hearing.
But you’re right – that is not the ikar reason to not listen to goyish music, in any event!