But warp, used elsewhere, means the warping of the space-time continuum. Some will say that this warp drive is nonsense and impossible. We can compare warp drives to today's jet engines. Jet engines pull air in and push air out behind it. What Chung suggests is that the engines will pull the air in but not push it out the rear.
Space is supposed to move past the ship with it's engines pulling and pushing at the same time.
The engines aren't going to just pull space towards it and not push it out the rear. All you need to do is contract spacetime in front of your ship and expand spacetime behind your ship. First, to expand spacetime behind the ship you'll need matter having a negative energy density like negative mass, and lots of it too. It is unknown in physics whether negative mass or negative energy densities can exist. Second, you'll need equal amounts of positive energy density matter, positive mass, to contract spacetime in front of the ship.