"That's correct. However, they weren't called Palaces, but Dungeons. They only appeared when someone entered the Midnight Channel of course; usually, never by their own accord." So they could probably figure out how things possibly went down considering those limited facts... and if they didn't, it would give her a gauge on how their group figured things out - who might keep track of information besides Futaba.

"As for the Dark Hour, it does. Apathy Syndrome would rise and fall between the Full Moon cycles between 2009 and 2010. However, that incident was handled by another group of Persona users based in Iwatodai." She raised a hand to her chin and considered. "... I can tell you what I've learned from Kirijo-san and the Shadow Operatives, but they would be a better source for detail if they ever arrived here."