I must admit I didnt follow this completely. Do you mean that because Buffer pre-announced he will lend $5K to people, the prices of cars will increase to accomodate this $5K?
The extra $5k people have to spend would increase the price people are willing/able to pay for a car - and increase demand-- which would lead the car sellers to raise their prices.
Easier money will increase demand. Higher demand puts upward pressure on prices.