notice how the narrative slowly shifts over time. this is how you can tell someone is a liar engaged in an active lie. first it was a year or two, then it solidly became a year out. when there's subtle pieces of their story that don't add up it calls into question the legitimacy of their narrative. if it was schedule: /i'm scheduled for march of 2026/. that sounds much more believable than /a year or two/.
here's the important part: if you're going to lie, then you need to have just enough details to be believable without over divulging irrelevant information. when they start going off about this that and the other thing that aren't relevant to the point you can tell they're full of shit.