He was talking about page locking. I'm currently going through the process of setting every single page to registered users only, which is probably a terrible way to do it.
If you were self-hosting this then it should be easy to make a script that sets all pages to registered users only. Also, you're setting it to autoconfirmed, not registered. So you need to have been a member for a month and have edited 10 pages to be able to edit it.