When I became public as moderator I heard from a lot of users (e.g. [1]) that the biggest problem with HN was high-quality stories not making it to the front page. At first I was skeptical. I was looking at /newest a lot as a moderator and hadn't been noticing much good stuff on the cutting room floor. But the users saying this were good, observant HNers, and I kept hearing it, and it got me worried. So I started looking at /newest more systematically, and then I was shocked. Not only were many high-quality stories being overlooked, probably most of the finest submissions—the out-of-the-way, intellectually interesting, totally unexpected submissions that make for the best of HN—were getting ignored. I'm still not sure how I could have missed that; I must have been looking at /newest at least as much as anybody.
Since last summer, we've put a lot of effort into addressing this. One simple thing we did was clarify that a few reposts are ok if a story hasn't had significant attention yet [2]. That's why it's ok that nkurz reposted this one.
ScottBurson hit the nail on the head, I think: giving good stories multiple cracks at the bat is one way to counteract the randomness of what gets traction here. Sometimes people abuse it, e.g. by reposting things that don't belong on HN or by being overly promotional, but those are fairly easy problems to solve and their cost is much smaller than the benefit of having more substantive stories—especially those out-of-the-way gems—on the front page.
The above isn't an opinion about the current article, which I haven't read, but it's clear that nkurz reposted it for the right reason, which is that he thinks it's intellectually interesting and well-written. That's the kind of thing we want users to do.