I had that same exact feeling! I scrolled to the bottom looking for a date somewhere to confirm (there was none), but then saw the reference to stockfighter and finally dawned on me it was likely a new post. Then I read it.
At first, it seemed familiar to me too, so I can see how you might've been confused. Also, Patrick intentionally omits the date from his blog entries which likely didn't help you.
It's always disconcerting to get slapped in the face with clear evidence of a memory error. Did I combine https://news.ycombinator.com/item?id=9589223 and http://www.kalzumeus.com/2014/12/22/kalzumeus-software-year-... somehow? Who knows.