Actually, scarcity is linked to demand. Scarcity is less available than demand at a specific price. Demand = the desire and the means to purchase.
If car X is demanded ($$ avail, desire is there) by Y people at $Z, but there is less than Y car X... then we have scarcity.
The gentleman's point is there is increased demand at higher prices due to more money being available. But cars can't be printed like money.
The main problem isn't a lack of cars. It's an oversupply of money.