Er, why? There is nothing lost, the thread is still there to view (as a locked thread in this subforum, conveniently enough), and if you believe there was an unfinished discussion in that thread, just make a new thread dedicated to that discussion. Personally I don't see the need for a Bannerlord subforum at this point, but now that we've got one the old thread is superfluous.
Perhaps you are sentimental for that large old thread? Just remind yourself that most of it was complaining and tedious melodrama, and that there was precious little of interest or humour to cherish. Change always makes the grass seem greener on the other side, enjoy your nostalgia as you look back on the old era from the enlightened new one we find ourselves in (
).