That's just a different format view of the Forums. Everything you see there, you also see here. In fact, I don't even know what the point of that "archive" is. It's not even really an "archive". It's pointless and a waste of your and my time. Just search where bluebaron suggested and you will find whatever you are looking for, I promise.
In other words, there are no "closed" forums. Everything is open and has been from the beginning.
Fango