I think this one is easier than the older examples because the phrase is repeated several times, with slight inevitable variations, that make it more clear as you “average” the variations into a clear favorite.
The other “yanni/laurel” memes have repeated the same exact sound over and over.
I have some weirdnesses with my hearing because I was partially deaf until I was 5. When I came out of the hospital after surgery I was confused because I had never heard birds singing before, I just assumed they flew around silently.
I tried that test with good studio headphones (sound engineer) and as a 57 YO got nothing. Had a medical test and it sloped of to nothing at 16K, my peak loss starting around !2.4K.
I would suggest that any audio test that has to go through youtube audio compression may be ok but not good given anti-aliasing and the psycho-acoustic ability of the brain to interpret pitches that don’t actually exist in the air - think of hearing a double bass or kick drum on ear-pods that can never move the volume of air of the instrument does in the real world.
Interesting is that many of the sort after mixers and producers are in their 50s and 60s and are calibrating the high end frequencies from experience and memory… having said that, the top end fizz of a high hat is probably around 8K and the air on top is the higher frequencies (if you can hear them!?)
But Britain seems to be have more accents than most other countries. Two towns just a few miles away can sound different, like with Geordies and Makems.