I haven't had time to try those links, but hope you can find what you are looking for to read. The only ones I have found in the past are ones that are already in "Best of SoberRecovery" (another forum here) or in another forum.
I'm not a techie, but the way I understand it is that the old threads are out there in cyberspace somewhere but to find them and try to bring them here (as a group) would displace our current threads. Sort of like "restoring" on a computer will put the disk information on but overwrite what is already there.
And, we're not sure why we lost the entire forum either, and didn't lose any other forums.
It's all way over my head, but if you find any old threads that you want to repost, you could try it and see what happens. If there are going to be a lot, perhaps they could be flagged as "reposts" so not to confuse the newcomer.
Hugs