When you say “university staff”, do you mean professors, or some other technical support staff?
If professors, then reaching out by email is probably a good way to start. They may get a lot of emails though, so your best chance to get a response might be timing the email right at the start of summer when they hopefully don’t have any ongoing classes.
In terms of payment - most professors would happily talk about their areas of study with interested people for a short time (for free). If you needed a significant time investment from them though, then you might start having issues.
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.