The translator made a pretty good note.
What if the entire civilisation on Mars is an illusion, and that's why the Lifemaker can only effect those born on Mars? Remember, Fate's whole illusion thingo?
Besides, what has happened to Rankan? Was he also Lifemaker'd, or what?
But, yeah, I guarantee you a plot line where Negi restores everyone who has been hit by the Code of the Lifemaker.