I thought I could do better than that/the test was kinda shit, but I opened up a DAW and generated a tone at the right frequency and yeah, I can't hear it even though it's showing up on teh spectrum analyzer lul
everything below 16kHz, I could hear pretty well, but right at that threshold, nothing

also, looking into it, the .ogg file it plays for the test is recorded at 192kHz
loaded it into my DAW and while it isn't absolutely perfect, it's good enough for the test looking at it
you might get slightly higher results than you should due to hearing some lower frequencies due to aliasing but that's it