Every movement has a canon: the core principles behind it, a mythology about its history, and the textbook statement of its objectives.
Every movement also has a reality. Thousands or millions of people with their own ideosynchratic beliefs forming a complex social web. Within this web, a vibrant biosphere of memes [0] develop, spread and evolve on this social web. A movement is simply a name we give to a cluster of memes within this complex web. It is not any of the myths we tell about it; those are merely particular memes holding the cluster together.
The author of this article is a self described liberal feminist. She identifies a change that occurred within her bubble of feminism, where it became increasingly anti-man.
To be clear, that is not all the author says. Once she gets to the "Let's talk about how the patriarchy harms men and boys" section, she stops the meta conversation about the movement itself, and spends the rest of the article discussing mens issues directly.
However, to your comment, and the first part of the article, maybe we need to stop hiding behind the mythology we tell ourselves about feminist; and start recognizing that the "feminist" portions of the social web are still susceptible to anti-feminist memes.
[0] in its original sense; as a direct analog to the genes of biology.