He changes everyone's, as the Earth 1 Johnny Thunder (who's a 'hey youse mugs' type thug) told him to make sure the JLA never came to be.
One dissonance cited by other folks is that T-Bolt changes Krypton's core to inert lead, rather than the supercritical Uranium mass it was, meaning, Kal-El lives on a living Krypton with the other Kryptonians. So at the end of the story, 'setting things right' means the extinction of millions...