Obviously not Rob, but I don't think that article does a very good job of explaining. Red pill is about the revelation that women don't act or respond optimally to the behaviors men are taught by society to emulate to get, well, laid. That women are motivated by certain psychological attributes that, once understood, can be leveraged to be more successful in dating and relationships (if your idea of success is more sex for less investment). Theories revolve mostly around how to be more attractive and effective in the sexual marketplace. The advocated behaviors for men can apply inside or out of a committed relationship, but are probably most effective outside of a traditional marriage.
MGTOW and Men's Rights are more focused on how the current societal and legal systems are not good for men, with MGTOW opting out of traditional (or sometimes any) relationships and MR trying to reform the system. But don't conflate the three, while each may have disdain for traditional marriage and therefore intersect in some discussions, each has a different viewpoint and fundamental goal, and at least between MR/MGTOW vs RP, very different philosophical approaches.