I would just like to point out that even if we (or Venat after we left) did successfully change and rewrite events and create a better path thanks to our foreknowledge, we would not see the result of it in our modern timeline. There still has to be a timeline where things played out as they always did in addition to the one where things were changed, just like the Eighth Calamity timeline still exists alongside ours.

Either the setting in Elpis actually is at the start of that branched timeline (unlikely due to Pandaemonium apparently requiring a time loop) or it will branch from ours at whatever point the events we described to Venat become impossible to occur. If it happens, we won't and can't know, any more than the occupants of the Eighth Calamity timeline can know whether G'raha succeeded.