As an avid vaporwave listener, I’d wager that listening to music slowed down / pitched down has a calming psychological effect in general. In other words, 432hz is not some magic number, it’s better because it’s lower.
So if we ignore the tempo; What makes the flattening of a note "calming"?
If anything I might become a bit excited or agitated by the breaking of expectations. Though 8Hz is somewhat subtle.
I'd be curious what songs they used for testing, since I'm thinking that some songs are simply calmer than others at 432Hz for whatever reason. Or visa-versa.
I was expecting to read something about the temperment as well, since changing the tuning allows for different spacing between notes. This too can somewhat dramatically change the feel of each key.
There's a whole genre of music called Slowed and Reverbed that slows all kinds of music down. Here's an example of a slowed song and a it's original:
Cigarettes After Sex - Slowed https://youtu.be/GGfWuK-fZYM
Cigarettes After Sex - Original https://youtu.be/sElE_BfQ67s
slowing something down from 440 to 432 that's three minutes long will result in less than 1 screen frame of difference time
you wouldn't be able to tell the difference
You're not wrong that you wouldn't be able to tell the difference as long as you don't have perfect pitch (it's a fraction of a semitone), but you might want to check your math.
sorry