First Question:

Source, in the description
https://www.youtube.com/watch?v=gEXWeUqc7jA

Anywhere I can go to confirm or deny this further? 
 

One side of the Great Pyramid, Egypt, at its sea level foundation, is 432 Earth Units (51.49 cm).
The major Toltec complex of Teotihuacan in Mexico, has its great Pyramid of the Sun with an overall base of 864 STU (Standard Teotihuacan Units) which is twice 432.
STU was the Toltecs measure unit for this site, as their "myths" relay it was taught them by the Shaman Wizard gods from the stars. Each side of this Sun Pyramid is 216 STU, precisely half of 432, and 3 x 72.

The heart has the least effort for pumping blood to endocrine glands, when operating in a rhythm of 72 beats per minute, it beats literally with the hologramme of the planet and the universe -- 72 bpm is the foundation beat of compassionate love.

THIS IS OMEGA SONIC SACRED GEOMETRY

The universe is based on harmonic series such as 72, 144, 432. And 144 
(a "C" tone in hertz) is a perfect harmonic of the speed of light, which is 144,000 nautical miles (144,000 minutes of arc per Earth grid second) in the vacuum of space.
Each of these harmonics are literally a mirror, or a cascade of mirrors within mirrors, 
that 8 hz can look into. For example 144 is 18 x 8 hz, and 72 is 9 x 8 hz.
The way that light travels in space is thus a 144 decimal harmonic (144:144,000),

The archaic Egyptian instruments that have been unearthed, so far, are largely tuned to 432 hz. In ancient Greece (the school book original place for music) their instruments were predominantly tuned at 432 hz.
Within the archaic Greek Eleusenian Mysteries, Orpheus is the god of music, death and rebirth, and was the keeper of the Ambrosia and the music of transformation (his instruments were tuned at 432 hz).

Second Question:

Any truth in this.

Words in Solfeggio frequencies in chakras, using the letters as notes from music.

More Babylon related for now, but I wanted it out there for theory, I found this on a similar video a few days ago. It may be useful for other words.

Crown 216,432, or 864 A
3rd Eye 144,288, or 576 D
Throat 192,384, or 768 G
Heart 128,256, or 512 C
Solar Plexus 182,364, or 728 F#
Sacral 303,606, or 1212 E flat
Root 228,456, or 912 B flat

BAB (from Babylon)
Root, Crown, Root return.

Hope it helps, any answers/methods/sources appreciated.