A sequence like that, if you happen to see all of the posts, can make a topic feel over-represented, but I'd say this isn't really excessive, wouldn't you? Keep in mind that on HN, reposts are fine if a topic hasn't had significant attention in the last year or so (https://news.ycombinator.com/newsfaq.html).
In this case there was a major thread back in Feb but I decided not to treat the current post as a dupe because the two articles seemed to differ significantly.
