Url changed from https://www.imediaethics.org/npr-retracts-reporting-mistakes..., which points to this.
https://www.npr.org/sections/ombudsman/2018/04/12/601650762/...
The ombudsman (person?) blames various parties, but (rightly, to astute readers of the retracted story) starts with the reporter, Aarti Shahani. She screwed up, and NPR management aren't sugarcoating that.
HN prides itself on its wisdom and judgement, but we got this one completely wrong too. When the original story appeared, nearly everyone here swallowed every detail of this whopper completely, while the few who didn't (hint: me!) saw their comments downvoted to oblivion.