Dang has been resurfacing threads that got limited engagement, but that either have a second posting that's doing better or that he simply manually resets the timer on. The process by which he does this also resets the time on comments, too, for some reason; I don't really know except that I've noticed it happen to threads I had open or threads I had commented on.
In fact algolia search shows this was first posted 3 days ago: https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...