It's interesting that Youtube is also recommending this to me today. I wonder what caused this coincidence. Anyone else seeing this on their Youtube feed?
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.
I had it in my feed and watched it some hours before this was posted here.
Or the other way around — YouTube started recommending it more, so OP saw it and posted it on HN.