Did I understand correctly? - The new "engine" only slows time inside the spacecraft. It doesn't "push" the spacecraft; it needs conventional engines to actual

Did I understand correctly? - The new "engine" only slows time inside the spacecraft. It doesn't "push" the spacecraft; it needs conventional engines to actually move. Travel is not faster than light, not even for its passengers. - Outside time still passes normally. Spacecraft speed as seen from an external observer is still the same. It doesn't help a space probe, except maybe batteries would last longer "inside". It doesn't help a spacecraft crew - everyone they knew at home would be dead by the time they return and they'll be ancient cavemen by comparison. It marginally helps a colony ship; it doesn't have to be a generation ship anymore.