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I suppose YouTube saw the spike in the video's popularity, caused by this HN post, and started recommending it to people who might be interested in it.

• stiGGG 4y ago
  I had it in my feed and watched it some hours before this was posted here.
• aprilnya 4y ago
  Or the other way around — YouTube started recommending it more, so OP saw it and posted it on HN.