What is this garbage? If I own a house/gold/collectable/toilet paper during covid/… and the value goes up, am I supposed to pay taxes?

Yes, you are supposed to pay taxes on that (or on the house specifically). It’s called property taxes.

If the value goes up, you pay more taxes the next year, if the value goes down you pay less.

I’m not sure the ownership situation of the company, but it is also independently in bankruptcy so I think that is being dealt with later

Gravity and vacuum are not mutually exclusive - you always have to deal with gravity forces, although they become negligible pretty quickly when you get into and then leave orbits.

As to the specific claim, I suspect that the experiments they are currently doing (in vacuum chambers on earth) have gotten to the point that they are measuring the propulsion system producing more thrust than it’s own weight (T/W >1), which would technically be enough thrust to overcome gravity. Even if it wasn’t practically useful for actually getting to orbit, that amount of thrust on a reactionless motor would be incredible, and would totally unlock the solar system for us.