Thanks for the demonstration. Worse than I thought, but yes maybe spurious signals from lighting or so.
While I won't even start talking about "music" in >20 kHz frequency ranges (as there is no instrument to speak of), there is a physiological aspect to it as well. A 10 year old
might be able to hear, maybe, 22-23 kHz, a 20 year old 19-20 kHz, a 50 year old 16 kHz if he's lucky. And then at proper levels and not at -100dB. Yes I know there will be people who think they can hear an ant coughing at 100m, or the length of a power cord, but generally, this highres stuff is in large parts a waste of bandwidth and, well, snake oil IMHO.
That said, for the average listener it may sound just as good as any other, if recorded, mixed and mastered properly (save for the forgotten low pass)
because most tweeters will "convert to heat" any signal above 25-30 kHz. So probably a non-issue, apart from annoying one's cat etc.