As that rightly states, D-Notices are requests to not publish. They have no legal standing, though they are frequently obeyed. (One relatively reason example was the D-Notice concerning Prince Harry's military deployments — for the sake of his safety and of those serving alongside him.)
What's really disconcerting is that the other outlets have decided this isn't sufficiently "in the public interest" as to disobey the notice.
What's really disconcerting is that the other outlets have decided this isn't sufficiently "in the public interest" as to disobey the notice.