car salesmen. They have their own math

Today we decided to see what options we have for replacing our faithful tow vehicle.  "Willy" the Jeep salesman actually said this to us tonight: "You should really get a new 2023 Jeep instead of a used one.  You will get a $7,500 bonus, well, it's not actually a bonus.  Actually, you won't have that $7500.00 taken off the price.  But you will get  $7500 tax rebate (somehow)...."   "It's a great deal!"  Ah......no.