Looks like a bad deal, tbh. A used 2070 mini at a 70K price point?
You could get a new build with better performance as well as the 5700X3D at a very nice price of 69,069 -
https://pcpricetracker.in/b/s/6d3d8394-209f-4143-885b-7cbdf0064718 (parts picked out randomly to show approx. price points).