I have no idea the terms of the lease nor would I likely understand them LOL. One thing to find out though, is there GAP insurance? That’s meant to pay off any difference in situations like this and many lease contracts include it.
From what I am reading here, it appears that gap insurance is not an issue. The book value of the car exceeds what the person leasing the car still owes on the lease, so the car is not “upside down” in a way that gap insurance would be needed. Maybe I’m wrong about that?