If the vacuum is indeed mutable and degradable as was explored, then it might be possible to do/extract work on/from the vacuum, and thereby be possible to push

If the vacuum is indeed mutable and degradable as was explored, then it might be possible to do/extract work on/from the vacuum, and thereby be possible to push off of the quantum vacuum and preserve the laws of conservation of energy and conservation of momentum. It is proposed that the tapered RF test article pushes off of quantum vacuum fluctuations, and the thruster generates a volumetric body force and moves in one direction while a wake is established in the quantum vacuum that moves in the other direction. ...well, at least it's better than calculating the theoretical produced thrust by ignoring the axial component of the radiation pressure against the side walls. Which is how tapered resonant cavities like this were supposed to produce thrust when I was in high school. But, leaving a wake in the vacuum should require that the vacuum exists in some particular reference frame. How's that supposed to work? Or since the paragraphs immediately before that one discussed the vacuum behaving differently when there's stuff in it, are they just saying that something is being exhausted out the back (which should be visible by some sort of effect on the vacuum?) even if they have no idea what that something might be?