It's not original but nothing matters anymore. Book of the New Sun is a strict example where everything* is supposed to have technology powering it, even though it's described as magical. Prince of Thorns is one where it's revealed that atom bombs tore open the world of the dead and that's why there's magic. Dying Earth in general uses it as a setup for various plots. But it doesn't matter. You can write anything again. Nobody's going to notice