The best proof that time travel is not possible now and not possible in the future of the human race is that we do not have tourists from the future gawking and taking holographic pictures when historic events take place.
As far as I can tell, the ‘whistleblowers’ in these articles are not talking about travel ‘forward’ or ‘backward’ in time, but in traveling large distances in an ‘instant’ of time.
I believe they are referring to the possibility of expanding it to include travel forward and backward.
It is difficult to tell since much of their information seems to come out of the STAR TREK NEXT GENERATION TECHNICAL MANUAL.
As is often the case, those who really know, would not tell. Those who would tell, really do not know.
What do you think UFOs and ghosts are?