The demon doesn't know these things. He claims that no, he's not a fake, but he's still a bit dizzy from being strangled so he might be forgetting some stuff.

When asked about Totodile, he claims it's too dangerous to bring him out.

At the same time though, he's cautiously preparing to fight since they're asking way too many questions. If they accuse they accuse him even more about being a doppelgänger he'll attack with demonic tentacles emerging from his arms, still wearing Jean's face.