Tajmar's test rig had several potential flaws, and it was not entirely certain that the EMdrive cavity he was testing was resonant. The couplings also could have let to magnetic interference that would have raised the noise level over any thrust they might have gotten out of their EMdrive unit.
Ive read over the prepublish paper but I don't really understand the point they had in lumping Mach Effect Megadrive in with the Em drive test, in any case. I don't know a great deal about the Emdrive theory, if there even is a consistent one, but MEGAdrive units right now are left at very low thrust levels, which are hard to discern from lorentz fprce and ambient heat. unlike the Emdrive, Woodward and Fearn, along with Rodal have had good reason to understand the thrust levels they are expecting, and so far NIAC has accepted their initial results as above the noise floor. They are apparently going to test with piezoelectric materials that can handle higher current, but that is yet to be seen.
In any case, I wouldn't put Tajmar's work as the nail on the lid to either of these ideas, though it does seem like some where salivating for the chance. My all around guess is that whatever thrusts EMdrives have seen that cannot be explained from spurious effects may be the results of Mach Effect, and if so it would make the EmDrive a cul de sac of sorts.
The problem all of these devices have is that budgets to test them are so small that no one has the money to test a truly large high power model in a vacuum chamber (or orbit) where these issues would not be a problem. When you're dealing with 5 micronewtons, that's a ridiculously small number. The closest to that has been the Eagleworks test but Eagleworks really has a tiny budget that itself ought to be measured in micro-newtons.
