Always unsure how to feel about stuff like this. I do not see anything inherently wrong with wanting a group of a specific gender for purposes of discussion of gender-related issues. On the other hand, video interviews and special permission needed to have such a discussion seems rather far afield of being able to create that discourse.
Still, societal induction does not just happen, as everyone here seems to think. Some people have a genuine and legitimate fear or worry of the other gender, and many of those are valid and being able to enter society normally is not an option for those individuals. They need a space that feels safe for them and though I'm not sure an internet forum is the place for that, I see nothing wrong with it.
The moderators probably could have been more even handed and simply state that they could not conduct video interviews as a precondition for joining the group, or something else. It's probably not under the moderators' purview to oversee the groups in such a capcity however (never been on their forums so if I'm wrong, apologies).