Not quite correct.
The signal in the experiment you referred to didn't go backwards in time, it just appeared to move faster than the signal did in a vacuum, or in a fiber optic cable.
the aparatus, if I recall correctly, involved a high magnetic field, with a high voltage between two parallel plates, separated by about a wavelength in a vacuum. The interpretation made at the time was that the plates and magnetic would, working together, suppress the creation and destruction of virtual particles, which is believed to occur in empty space all the time, at a small enough scale. If i remember correctly, the researcher (Russian, I think) calculated that the speed of light under these special circumstances was about 25% faster than in a vacuum.
Richard Feynman is the one who equated faster than light travel with time travel. It may not turn out to be true. We really don't know enough to be able to say.
