I would say you can argue there is some benefit on a car you can buy at the end. But with tesla, you are literally paying a high down payment for the opportunity to rent the car from them. That 10k doesn’t give you any equity. But the sellers probably realizes that. He’s just at the wrong place to try to pawn it off on someone.
Sometimes Tesla lets you buy at end of lease but they withhold the authority to take the car back, so as of now I don't know if this car will be buyable at the end. Either way, if you're looking for equity, leasing is probably not the move for you. Better to buy.