If they had anything real, they would not demonstrate a drive, they would create a minimalistic, clear and reliable lab-setup that demonstrates the effect beyond all doubt and that could be recreated by other teams. Instead, they insist on a relatively complex set-up that cannot easily be recreated but can easily be manipulated. This is the hallmark of scientific fraud: Make grand claims and demonstrate them in a way that looks good but could be entirely due to measurement errors, hidden energy sources and effects, etc. and that cannot be validated by other teams.
Furthermore, if it violates established physics, it needs more than simple scientific proof (i.e. an experiment that other groups can repeat), it needs extraordinary proof. It does not even have simple scientific proof.
For some nice other fraud in this venue, look up the Rossi E-cat or centuries of perpetual motion machines.