Hello and welcome! My name is XXXXX XXXXX I will try my level best to help with your situation or get you to someone who can.
The "as is" designation will cover most aspects of a vehicle sale and prevent the buyer from being able to return the vehicle and cancel the sale. However, one of the parts of the purchase contract
that has to be fulfilled is the seller has to be able to transfer the car to the buyer so they can get title in their name.
If whatever problem can't be cured so that the buyer can transfer the vehicle into their name, and it is something with the vehicle, not the buyer, then they could sue for breach of contract
and cancel the sale. The purpose of a sale is to transfer legal ownership
and that is evidenced by the title being transferred.
But if there is something wrong with the buyer's license so he can't get it in his name, that is his problem.
As an aside, it is definitely in your best interests to get the vehicle out of your name because if the person gets parking tickets
and doesn't pay them or they get in an accident, it could come back on you as the registered owner of the vehicle.