This is not entirely true. Your link leads to a 56 minutes video while my linked video is just 4 minutes and providing the relevant discussion point.

Moreover, I couldn't find any larger discussion: I searched HN with the link you gave and found only two postings, one with 1 point and another one with 7 points and only 2 comments.

Probably this one https://news.ycombinator.com/item?id=15900551

Thanks and this link makes much more sense (but the video is again 56 minutes but there is a marker).

I hadn’t seen this yet, I think we can all agree using machine learning to brainwash people is bad and probably more effective that you might think given Cambridge Analytica’s and Russia’s recent successes.