Nitpickier

Good call, "unlocked" was the wrong wording choice there. Though a technical question: What defines "autoconfirmed" on CP? Is it just plain "only registered accounts can edit" (which would put autoconfirmed on the same level as unprotected since CP doesn't allow IP edits)? Or are there more criteria?

I don't know exactly, but it should be slightly more than registered user. They can take some liberties with the setting, so it possibly includes having a couple of comments under your belt and being around for a few days.