I'm fairly sure that's exactly what it is: They don't want women on the site (unless they're in porn or posting nudes for the pleasure of men of course), they want to preserve their little woman-hating paradise where they don't get criticized or called out. Any subs that offend men or don't include men will be banned, hence r/gendercritical and so on.
They're not even subtle about it. I used to read on Reddit quite a bit and there are tons of subs that have literally been taken over by misogynistic reactionaries (you know, incels, mgtow types etc. who violently hate women) and nobody cares or even seems to notice. Least of all the people in charge.