It's no such admission. In fact it's the opposite, because if we thought the story didn't belong on HN, nothing would be easier than to let it sink without a trace.
I think the story belongs on HN because I know a little bit about the historical significance of Seymour Hersh and I think the appearance of this story is intellectually interesting. Maybe I'm the only commenter who feels that way, since most appear only to want to score points for their pre-existing political side, but it's our job to serve the intellectual interest of the larger audience, most of whom don't comment.
Re the question mark in titles, see https://news.ycombinator.com/item?id=34713747. This is a longstanding practice and has nothing to do with the topic.