No one has to go to the press. They chose to. Other people, when they are fighting city hall, hire a lawyer na dput together a suit.
If you talk to a reporter about your personal business, it is no longer your personal business.
Why do you even think it matters?
Because the law in question says "blood, marriage or adoption."
If he adopted the kid, he wouldn't have to go through the lawsuit or the unspeakable indignity of marrying the woman who shares his bed.