Wait - is the author just measuring Zillow's accuracy the same way Zillow does? As in, "Here's a poll that asked N people something. Let's check the poll's ac

Wait - is the author just measuring Zillow's accuracy the same way Zillow does? As in, "Here's a poll that asked N people something. Let's check the poll's accuracy by calling 3 of those people and asking them the same question again." That seems... not useful in any way.