The site guidelines ask you to email hn@ycombinator.com with questions like this: https://news.ycombinator.com/newsguidelines.html.

Users flagged it. We can only guess why users flag things, but in this case I suppose it might have been a combination of users who are fatigued by this general topic having been repeated so frequently in recent weeks, and users who agree with the decision to take down the interview and don't think HN should have a thread about it. As I said, though—those are just guesses.

In the meantime, someone else reposted it and it was on the front page: https://news.ycombinator.com/item?id=23258432. But since this post was first, I've turned off the flags on it and merged those comments hither.