User blog comment:B214/Volume 21 info & spoilers/@comment-77.97.12.117-20160523110847/@comment-9595671-20160919015639

Actually, a talk with Shiva and Ajuka pretty much implied Trihexa did too much damage for them to hide it. At best they can only hide specific things, like God's death.

It's hard to really say much related to EX unless the EX kids outright said something, they never mentioned if the supernatural was exposed, and they probably wouldn't have as that would have been too big a spoiler.

For example, what they said about Sirzechs and Azazel implied something would happen to them, as of this volume we learned what that ended up being.