1. Censors don’t censor things based on being “too deep for 8-year olds”.
2. This is said by a crazy a super-hero cartoon hero dressed in an own-themed leotard, mask and cape.
3. This scene points to the meaninglessness of comic book multiverses, and time travel theories, and actually isn’t above 8-year olds. I was thinking about infinite universes before I was 8, in more sophisticated ways than this guy.
4. If I were a producer or continuity editor for this show (not a censor), I would point out that while this is an interesting perspective, it doesn’t really seem to make complete sense, or I’m missing something, because it seems to me that destroying one planet with a bomb is not going to have an effect on its past, nor on the existence of other planets. (Or are those supposedly retroactively formed in the future somehow?)