If that was true, they could just come back with hyperdrive since Star Wars hyperdrives basically take you anywhere in the galaxy in hilarious short amount of time. Then again, Rebels was absolutely shit and I definitely wasn't paying much attention to the finale, but they were definitely in that stupid time travel dimension at the end of the show. They may have been shown leaving it though, I spent most of the episode being annoyed at it so I might have missed any specific talk of Thawn and shitty space Aladdin's fate
Close your eyes. Breathe. Have some tea. You seem very worked up.