Well since the person who seems to hate him so much gave a talk at that conference same conference a year before that had nothing to do with Javascript or node

Well since the person who seems to hate him so much gave a talk at that conference same conference a year before that had nothing to do with Javascript or node (something about community/inclusivity big surprise) I would say that "on topic" covers just about anything for these circus events. I would say he is one of the more likely speakers to stay on topic.