This is a relatively easy litmus test. Let's say someone you decided to do an investigative piece on you Annie Lowrey (arbitrarily deciding because you write publicly that it fits his definition of a "public figure) and publicly states considering visiting you at home in order to learn more about you.

Would you feel creeped out or "hey, come on in?" To me, _why by his actions has demonstrated that he wants his privacy and to be left alone. It is not for you to decide that he is a public figure. Prioritize the human aspect and respect his wishes before the advancement of your own career.