Not all Audi franchises are complete bar stewards. There are advantages with an Approved Used Warranty. It’s normally 1 year, but if bought with their finance, then up to 2 years. However that changes all the time and depends how aggressively they want to sell cars and the market at the time.
Audi long service regime is a complete gimmick. Any oil viscosity will diminish and to expect a car to cover 18k miles or 2 years is overly optimistic. That suits Audi, as a lot of cars when purchased from new were on PCP deals or similar and then the cars were returned for GFV (guaranteed future value) often based on limiting mileage after 3 years and overall condition or face penalty. This keeps their servicing costs down (as often servicing is part of the finance deal), but engine wear and issues don’t materialise until it’s left Audi and it’s with new owners, often a few years down the line.
The only reason I can see Audi are interested in this car is its abnormally low mileage. Normally they’d retail cars up to 5 years old. Personally you’re better with an average mileage car. In terms of history, yes it can be electronic, but any dealer worth their salt will divulge history, if not walk away.
I’d be cautious buying a car privately, especially at this kind of money, but depends on your attitude to risk. Even with checks like Car Vertical, then things go wrong as soon as you drive away, weak batteries, demising mirrors (especially auto-dim) ones which are expensive, clutches, etc.
For non Audi franchises, triple check warranty. They are normally standard 3 month warranties that you in effect extend financially if you want longer period, but are so loaded in the dealer’s favour, such as oil change service every 6k miles or 6 months and stamped via VAT garage. You can’t do you’re own servicing until out of warranty. Even if you claim it can be a minefield.