Between his liminal abilities and using some context clues, it should be pretty easy for Enoch to figure out that Leonello & Lundy didn't have any foreknowledge about the Waldingers' device and therefore likely had no reason to seek out information about them before arriving today. Throughout the course of his interview, he should also be able to surmise that Leonello is not aware that he knows she's lying (unless he does anything that might show his hand).