Whoops. My apologies.

I wonder how HN allowed posting a duplicate article!

When articles don't get much traction, dupes seem to be permitted by the algorithms. One post had a comment and another had 13, so it makes sense to let it through. I don't know the actual implementation, but this is what I've observed.

And the thread you linked is itself a duplicate of this: https://news.ycombinator.com/item?id=14167469