I'm not quite sure if this excerpt is about the Celestials in particular... The book has some age to it, but it could foreshadow that whatever we're stuck in has a longer history than the Watchers arriving last week.

[ It could be that Watchers, as a role, have always been around? He isn't sure. Anyway, I think?? Temporals are made of something else that isn't dust, but I need to comb through the public NPC threads again. ]

I'm not sure if it implies a separation, or if they truly mean discovered.