Going by the add I'm guessing this yard is some sort of sales facillitator (We are located 20 minutes NORTH of PERTH and we are HASSLE FREE as we have NO SALESMEN! You deal with the owners direct). This, I presume would then put the onus of disclosure for information about prior history, speedo reading etc, onto the owner of the vehicle rather than the car yard.
As others have said, if you looking at buying a vehicle do your research, ask questions, and get it checked by a reputable workshop before making any offer or placing a deposit.

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The older you get the more you realise that no one has a clue. Every one is just winging it.
MY05 STI