At more than one point in the video he says that the spread of this kind of automatically generated content was not YouTubes fault, but in a way I think it is. It seems likely that the methods of manipulation shown in the video aim more at getting such a piece of content going and less at sustaining it. If "the algorithms" goal is to maximize viewer retention and this kind of autogenerated content keeps some people glued to the screen, watching ads and writing comments, it's really doing an excellent job, it's just the goal itself that is unethical.

Edit: Typo