ANYONE can find out what you paid for your house, it's public info on the county auditor's website. I'm guessing that's where a lot of the info comes from since it states we have a pool which you can also see from the auditor's website. If someone knows your name and what county you live in, they can find your address very easy if you're a homeowner.
One of my favorite things to do when I'm bored is cruise the Clerk of Courts website to see if anyone I know has been arrested for anything or owes back taxes.

Yeah, I need a hobby.