As previously noted, the stated rationale makes absolutely no sense. It seems clear the motive is to avoid comparison of their sales prices with other sales prices.
But that confuses me, because I thought each auction WANTS to show high sales prices to attract consignors?
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My avatar is a sketch by my son who is an art school graduate. Some of his sketches and paintings are at
https://www.jamesspaethartwork.com/
He is available to do custom drawings in graphite, charcoal and other media. He also sells some of his works as note cards/greeting cards on Etsy under JamesSpaethArt.