Trolling is a word. It means something: "make a deliberately offensive or provocative online posting with the aim of upsetting someone or eliciting an angry response from them." I can't help but wonder why the author attempts to describe anything he doesn't like, in his moderator role, as trolling. This seems to be a general trend in newspaper people describing their comment sections.
To elaborate on your point - from the article: "They are comment-thread poison – men’s rights activists who act as if articles about women’s issues are their gender’s single biggest problem, climate change deniers who will drag any conversation about energy policy into murky pseudo-science, and borderline racists for whom there is no issue that cannot be pinned on immigration (UK) or black people (US)." ...incidental…
Great to have you in this discussion, did you realize you were drawing an exaggerated conclusion from weak evidence when you wrote your comment? Do you realize it now? Would you consider your comment to be one with an agenda as the author theorized or do you have a different motivation?