My reading of this is that the moon is safe because it's out of the scope that Meteion is aiming. We heard from the Watcher that the End of Days was happening where the aether flow of the planet was weakest, but with the moon not being on the planet, it's effectively out of range.

Hell, if we're going with the assumption that the End of Days is essentially happening because of Meteion forcing corrupt dynamis onto the planet, it makes total sense that she missed the moon. The last time she was on that planet, there wasn't a moon, so why would she extend the range to hit something she didn't even know was there?