There are two tanks 400L and 200L of compressed air at 10000 psi.

With this it is possible to do these stunts. But only these stuns. (with the guessed mass of 2000 kg).

So while it is impractical and you need to compress air for hours in order to do 6 seconds of flight, it is real probably.

Also compressed air at 10 000 psi is basically a bomb in your car. I would not go anywhere near that!