Crook_Shank
You need to make a wish to restore their world. You could use the time machine to bring Kami and the dragon balls to the future and wish it for it. Or make your own set of dragon balls. In fact, I’m shocked canon Future Trunks was content with living in a post-apocalyptic hellscape even after killing the androids.
Goku knowing all the planets and having instant transition can find New Namek in this timeline, I think that's part of the reasoning behind his wish. NN should exist, so they can get Dende to replace Kami. But remember that in this universe the dragon balls are restricted to recent deaths, so I don't think anyone that's dead for over a year can be revived. They could fix earth so it's not a ruin, but most people will remain dead.
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