indesolution

I think you're right but any substantive evidence to support your hypotheses is going to be impossible without getting close to the portal. A lot of us come from worlds where magic is a fact or at least based on physical laws that don't exist here, since so far it seems impossible to do any kind of magic that's not already part of an inherent ability. So the portal probably isn't magic and therefore is based on good old-fashioned science, only there's the whole thing of learning everything that qualifies as old here. But if we know what makes the portal tick, then we know what they know including whether there's proof that we're fake. That acceptable, Agent Scully?