Well I mean kinda.
It was really only saved in the sense that they put a zombie time bomb in it and just planned on waiting for it to hatch and destroy the planet with it.
Had it not been for plot threads dropping in this show like flies, that could've been a pretty big deal, and I'm sure The Diamonds only let earth sit in peace because the entire thing was doomed anyway.
But I mean yeah, I guess they bought a few thousand years and just never bothered to think about where those millions of corpses went after the Gem Nuke.
Rose had to get dicked through most of human history in the mean time. Must have just slipped from her thoughts.