I don't think the scientists at NASA are bogus. They managed to calculate when a probe would reach pluto that was only off by a few seconds. There is still a lot of research that needs to be done on that, but there are those that say it isn't breaking the laws of physics.
We shall see I guess, but it has been replicated in 3 places now taht I'm aware of, two of which are serious science outfits.
The NASA is very big, they went to the Moon but they also published the infamous arsenic life paper ( https://en.wikipedia.org/wiki/GFAJ-1#Biochemistry ).
In a "massless" thruster, the theoretical maximum Thrust/Power ratio is 1/c = 0.0033 mN/KW if you don't want to break the conservation of momentum, special relativity or quantum mechanics. You could get this value with an ideal perfectly efficient laser beam. The latest NASA version proclaims (50 uN / 50 W) = 1 mN/KW that is 300x the theoretical maximum, so if it's not an experimental error, it must be breaking some of the currently supposed physic laws.
If you have not done few physics labs, it's easy to underestimate the measurement problems and the level of noise in experiments.
Most of the Physics community thinks that this is an experimental error. One symptom is that at lunch in a Physics department nobody talks about this. If this were real it would be a groundbreaking result because it breaks some of the most fundamental Physics laws.