This is the reason:
Looks like the PieFed’s old post deletion does not take into account whether a poster is local to a deleting instance or external to it.
At least one banger of mine on this comm is already affected.
Memes on piefed.zip should be safe.
This is a toggle for particular communities that Piefed admins can turn on. It’s purely done to safe space. In the case of piefed.social, which this applies to here - Rimu chose it for most meme communities because he doesn’t value them in the grand scheme of things.