Wrong. Propulsion based rocket engines produce more thrust in vacuum than in the atmosphere due to lack of atmospheric pressure.
Am I right if I say that the reason you don't think a propulsion-based system would work in vacuum is because you think it needs to push against the particles in the air in order to move? If so you've misunderstood. Propulsion engines simply work by continuously generating a force in the opposite direction of it's intended movement, which in accordance with Newton's laws results in an equal reaction the other way. That force can be released regardless of the presence of air or atmospheric particles.
I know you won't accept Truth because you have to defend your position as a disinformation troll who worked for NASA.
There are two reasons why no rocket will work In a vacuum, the first Is you can't burn anything In the vacuum of outer space because there Is no oxygen, also the oxidizer explanation doesn't work, you need vast amounts of oxygen to keep the process going, the second Is there Is nothing to push against, period.