Can we prevent an admin from seeing a private category?

[simon]

@Wall-E

As the admin of our self-hosted instance, can I create a private category for a group, and offer them complete privacy so that I am not able to see what they post?

No, the only thing I am aware of to prevent admins from reading content on the site is to encrypt PMs with Discourse Encrypt (deprecated). Otherwise, site admins are able to access the site’s database, so there would be no point in attempting to hide content from them.