Well it's being sold at auction, not by the first party and it's very likely that any questions a bidder has can't be answered anyways. You take your chances and the payoff is a good deal for you. The auction makes money from volume.
I agree though that changing the odometer is criminal to do. But one shouldn't be buying cars at auction unless they know what they're doing. Buying a used FedEx van at auction comes with a few known... stipulations.