Well, here's the thing, though- I don't like Zoe Quinn at all. If that blog post was true in the least, I think she's an awful person, and that's bad.
However, that doesn't have a damn thing to do with "ethics in gaming journalism", or whatever drivel they're on about. Her sex life is irrelevant to the development work she's done, and the gaming industry as a whole. As you say, if the roles were reversed here and a man had done this to a woman, yes- it would be awful! However, do you think for one MOMENT that it would have gone on this long and been this big of a deal?
So, no, criticizing Zoe Quinn in and within itself is not misogyny. However, using her private life and personal relationships to go after other important women in the gaming industry just for the crime of not wanting gaming journalism to cover Zoe's sex life IS misogyny.