I watched the video and while there's no doubt he is smart (probably) the quantum mechanics section was really just basic definitions of quantum numbers and the wavefunction.
The part about relativity is just nonsensical, there's nothing in his equations that suggests density is related to the speed of light (although the speed of sound is inversely related to the density of the medium - it seems like he would be in favour of an aether theorem), the speed of light is very well defined and tested and there is absolutely no evidence for tachyons (I don't know of any theoretical background to support tachyons either).
I hope he keeps it up.
EDIT:
That is completely inaccurate, there are plenty of ways the theory can be disproven - if that were not so then it would not be a scientific theory. Protip, everything in science can be disproven.