Unfortunately, as far as we have been able to tell, we lost backups of the old forum data during the move mentioned earlier, so as much as we’d like to put the old forums back up in read‐only mode… we can’t. 
(I actually thought I’d written that in this thread much earlier… but I guess I didn’t. Maybe I wrote it in another topic? 
I know it’s more than a year ago that it was discussed on IRC and we realised that the data was completely missing.)
Unless some miracle happen and we find some long hidden/lost backup… what’s archived now of the old forums is what will ever be archived.