Using Bill Clinton was a brilliant move. His presence enabled NK to save face - anyone less than a full former POTUS wouldn't have worked. Further, I'm sure that Bubba, being Bubba, charmed the heck out of all.
He is not actually an official of the US diplomatic service, so whatever he said, it's not official policy.
Can't complain about the outcome; only suggestion that I would make is, in the future, to have journalists sign waivers before going overseas into areas bordering hostile countries - if you're dumb enough to wander too close to the troubled site, y'all on your own.