After also reading the original written version of the piece, and the post on r/exredpill it was largely based on -- and as someone who has a particular interest owing to my adolescent involvement with a political cult -- I think it's important to make a distinction. People in the cultic studies field say there as many groups as there are people in the group; one member may have a cultic relationship with it while another doesn't at all. And the groups themselves are on a continuum. This is why those in the cult awareness field prefer to speak of cultic processes rather than of "cults" as a discrete category of groups.
The r/exredpill poster in question evidently developed a relationship with r/redpill (which, by the way, has basically nothing to do with actual MRAs or men's rights activists -- a common conflation in the feminist milieu) that had significantly cultic characteristics. But, as Alison and Karen point out here, this wasn't because anyone at r/redpill was using deceptive/manipulative recruitment tactics -- as are characteristic of "cults" in the strong , distinctly negative sense of that term -- but simply because he was desperate to find something that would make him feel like less of a loser. The cultic aspect of the relationship came mostly from him and not from conscious, covert manipulation by the group, as you would find in something more deserving of being called a destructive cult.