This video spends a lot of time describing various unrelated physics effects in a tbh quite decent way, and then jumps to a bunch of completely unsupported conclusions. Squeezed vacuum, sounds kinda cool. It is kinda cool, but it has nothing to do with "breaking the vacuum". The former is in essence just light that obeys certain statistical properties, while the latter refers to something called the Schwinger effect which is the spontaneous creation of electron-positron pairs from extremely strong EM-fields. Anyway, they try to make some kind of analogy between superfluid helium and this plasma surrounding the hull, suggesting it would be in a coherent macroscopic state. I personally know the people who hold the current world record for the largest system shown to exhibit quantum coherence, and they would scoff at this even harder than I am lol. Even if you take it at face value, it has nothing to do with going fast. They talk about removing inertia and gravity and give no actual justification for it other than "we're pulling particles out of the vacuum so there'd be a void" - no you're not pulling particles out, you're creating them by depositing insane amounts of energy, and that vacuum (the EM-vacuum) has nothing to do with inertia or gravity in the first place.
I had a look at the patent itself and it's high level quackery.
The EM-field vacuum has nothing to do with the spacetime background unless you get into a quantum gravity regime, and we don't have a theory for that. One doesn't speak about a "nonlinear background" and the spacetime is the background, there isn't a background of it. He's just throwing words together and saying nothing, this is not real science and don't be fooled into thinking it is.