Because of forum index formats, to install data or a post where it was posted first before deleted, includes threads.
Is almost impossible to do,and if we wanted to do it that way, many man hours would be required to get it 90% correct.
So on a cost base, we are going to install deleted history in what are call "Historical Sub Forums"
In two stages, first install will require a member to log in to sub forum, very very soon after once installed, NO Login will be Required to enter a threads Historical Sub Forums. This is the best and cheapest way to return history to its proper place.