YarrMatey

I’m actually obsessed with something else… Hail Seitan! ⛧

It should not matter if it is secure in your case. The only ones who can read your messages are your server’s admin. That message is just telling you not to talk about sensitive things via PM, but messaging a mod about your issue is not sensitive. It is more secure to PM the mods than to make comments and posts about your issue.

You could try messaging the mods on Lemmy. You can click on the mod’s profile and send a message to them. You do not have to leave lemmy. There’s not much others can do though. Even messaging the admins might not get a response. I think there are kemonomimi communities on lemmy you could try sharing your art to.