I went to high school with Van Cliburn. He was a friend of a friend and I only met him one time. But in a town of 6,000 one knows quite a bit about people.
As for the smart a$$ remark, it makes you sound like a cosmopolitan.
Van Cliburn was born in 1934.
But even the article doesn't claim that Mrs. Alito knew Kopechne. The article claims that Mrs. Alito was crying because of someone her husband had probably met. That doesn't seem like a stretch to you?