I can't stomach a 5-hour video, so I looked at the PowerPoint presentation. As usual, a picture needs a thousand words of explanation (that is really what the old saying means) and the explanation was missing. He seems to have stumbled across another version of "pushing" gravity, where things are pushed together by the pressure of the surrounding medium and the mutual blockage of that pressure by shadowing. The astronomer Tom van Flandern was a proponent of that theory. It has some credence due to its similarity to the known mechanism of the Casimir force (mutual shielding from excluded virtual photons).

He derives some intriguing results from quantum theory, but his experimental method leaves many questions open, as he does not account for the Earth's permanent magnetic and electric fields. It would be expectable that electromagnetic field generation would interact with these fields. Using a balloon to balance the device is unexpected, particularly if he must take pains to exclude breezes. One might have supposed conducing the experiment in a vacuum enclosure with a scale balance to magnify any alterations in weight. Exclusion of subtle environmental interactions has been the bane and headache of most experiments in related phenomena (e.g., reactionless thrust). And while near-field effects might be justified, the demonstrated far-field effect of gravity is not so easily explained. It this effect is real, then one might suppose there would be a similar effect from the universal background radiation, but no one has offered any evidence of that.