Not necessarily a coincidence, I've often gone down a rabbit hole of reading triggered by an interesting HN comment; sometimes that comes back to HN in the form of a submission of something in the rabbit hole that I found particularly interesting.
Now that I think of it, it's probably not a co-incidence. The author 'zainamro' who posted the parent post, probably read my post (https://news.ycombinator.com/item?id=21730116) and then did a google search to come up with the video that he then posted.
I actually hadn’t seen your comment — I read PG’s essay and was similarly reminded of Chomsky’s view on education and specifically this video. So it was a coincidence in a sense but less so because of PG’s essay.