From the pics it looks like it's past the clearcoat, although it's really hard to tell.
If you can't inspect it yourself, ask the seller if he can feel the scratches with his fingernail. If he can, it can't be corrected by hand or by machine. You'll need to touch-up or respray. From the amount of defects, it really looks like a respray will be the best option, but also the most expensive.
However, if it is past the clear coat you can certainly diminish their appearance with polish, the polish will round off the sharp edges on the clearcoat making the scratches look far less noticeable, but again, they'll never get removed.
So find out if it's past the clear and let us know. If it isn't then you're in luck. You can find a professional detailer (not one of those wash-n-wax jobs) and they can fix it for ya.