That doesn’t sound like a federated wiki but more like federated account management.

Doesn’t seem to be in the latest open source release or at least I can’t find how to enable it.

Edit: according to https://activitypub.ghost.org/social-web-beta/, it’s indeed only in pro for now.

Wait, what were the arguments for electrons not existing? And by whom? It’s generally accepted that electrons exists and neither of their fields would work if they didn’t. You’d have to go really deep down into “well actually, everything is a wave” terretory to even get that idea and even then it doesn’t make sense.