The boards were pruned to about 6 months ago. Along with the old archieves being removed.
The webmaster is working on "The old boards will be brought back online soon, with closed registration and no user ids installed... . so users can view old posts... ... "
How long will it take? I don't know I am not the one doing it. Please remember Ken is a part time consultent, and some of the changes take a fair amount of time to code, test, etc.
It wasn't an oversight, it was done to help the performance of the current server. As said above it'll be a whole new ballgame once the hardware upgrade is complete.
Does this answer it any better?