I watched some videos about this yesterday. It seems relatively legit. The scientists themselves seem pretty suspicious of their own results which is a good sign. But I've only seen a few venues discussing it which is a bad sign. 

They've tested in a vacuum which means the thrust is not from ionic wind. They however haven't afaik ruled out an interaction with earth's magnetic field.

k00b

science

Discovering a machine that could somehow produce thrust without releasing propellant would be a game-changer for human space travel. There’s just one problem—such a device would defy the laws of physics.

This limitation has not stopped people from investigating the possibility, and the latest addition to the propellant-less club is an electrostatic design developed by a former NASA engineer.

While the company behind the drive, Exodus Propulsion Technologies, says that the drive can achieve a thrust to counteract Earth’s gravity, such a claim still needs independent verification and a healthy dose of skepticism.