He didn't. He told the person how much money they spent on alcohol, or how much the house they were selling cost. The house information would be available at a

He didn't. He told the person how much money they spent on alcohol, or how much the house they were selling cost. The house information would be available at a land registry, or on a credit report. The alcohol information might be available through a brag "I just spent 400 dollars on Z", or through some kind of facebook-tie in "I like X bottles of Y". Or loyalty points.