You might want to put a note about the sensationalist title, so that people don't just read the headline and come away with the wrong idea.

There's really no other way to implement this sort of a network. Once someone federates your messages, they can disconnect their server and keep your message forever. It doesn't matter what sort of protocol you put in to try to "securely redact" messages after the fact, there is still an edge case that the information that you make publicly available is available for eternity. If not by Lemmy itself, then by web scrapers, search engines, archives etc.

Cycle through generic accounts and don't put PII up. That's the best you can do with this sort of social media. If you want more privacy you need to take it to a non-public space, like chat rooms.