That is SOP for salesmanship. Never give information that might kill the sale. Only state the positive things, and never the negative things.
If in doubt, and the point is critical to the purchase, walk away.
Personally based on the mileage, I would be certain that those are the original tires on the car. They probably just got it in on a trade-in and want to move it out as quickly as possible, "AS IS".
IMHO.
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