Elias Abarco is one of fairly few people authorized to read Asmodia's mind when she comes back.
That's half the problem, right, all these people hear that they're not authorized to mindread the Project Lawful girls, or to punish them, or even to smack fucking Pilar in her fucking face when she offers then cake, so then things grow out of all proportion and they think the girls are something special.
People are sneakily lingering around where the resurrections are happening, hoping to get a glimpse of Asmodia. Haven't they got something better to do with their time than drool over a bunch of halfwitted wizard children that were meant to just be a nice welcoming present for Keltham, and which ideally would all be chained up in his room right now.
Whatever.
He tells them they can stay if they go invisible, because obviously he's not going to ask her any secret questions aloud, and if they want to gawk at this completely normal teenager and owe him a favor for it afterwards, why not.