Why does this story magically no longer become interesting because of a group that helps defected NKs?

There is nothing magic about it. The organization that’s cited isn’t the problem. The problem is the BBC cites that org as proof that this person’s claims are true. But neither that org nor the BBC have said, “we have corroborated Jin-su’s story.” On the contrary, the BBC just admits they didn’t or couldn’t corroborate the story themselves. So in my mind I may as well have read this article on any rando’s blog post, or in the NYT in 2001 under a Judith Miller byline. It lacks credence.

I wouldn’t have had anything to say if BBC said that they reviewed some documents that showed Jin-su’s claim. Maybe a few of the “hundreds” of fake IDs that he used, for example. But instead they just read more testimonies from PSCORE (presumably) like the one that they couldn’t verify for the sake of verifying this testimony!