Just out of curiosity,
Do you have ANYTHING in writing, an email, the original ad etc. that states the car is being sold AS -IS?

I will mention the following for others: I've learned in the last 25 years of being in business that People who are in a rush to get something done almost always turn out to be A PROBLEM.
After having experienced this 5 or so times, I noted it was a common trait these people seem to have
After noting this, It became a BRIGHT RED FLAG that I will not ignore, and send them elsewhere.