It's all an outgrowth of the whole A=432Hz thing, which is basically conspiracy numerology for music. The idea is that there's a base frequency of the planet/universe/whatever that is at around 8Hz, so something something, arbitrary math in abstract space founded on no material reality, bada bing bada boom, 432Hz tuning heals the soul and purges bad energies from the body. The reason why people generally seem to think it works is because the music feels "warmer" or they feel a sense of "relaxation", which likely comes from downtuning from A=440Hz, which is western canon standard tuning. Downtuning a piece of music will lower pitch, and lower pitches are generally associated with release, warmth, softness, etc. in western music. Same thing can be done with uptuning, where doing it strongly enough (like from 440Hz to 852Hz) may bring feelings of sharpness, spaciousness, glassiness, or a "crystalline" clarity.

It's basically people applying the new-age hokum mentality to music, but the idea is not based in any kind of scientific or musicological theory. It just gives people good vibes if that's what they're looking for; whether they assign deeper spiritual or cosmic meaning to that is up to them.

Fun video on A=432Hz: https://www.youtube.com/watch?v=EKTZ151yLnk