The top comment in this thread (from someone who speaks the language) says that he openly encouraged people to spam meaningless PRs in order to get "free swag." I think the rebuke he is getting is deserved.
Even the title of the video is "How to Earn Free T-Shirt, Swag & Goodies Online!", and the description is in the same vein mostly focusing on getting swag, while seeing (meaningful) PRs as secondary.