What is being done in the JS community by those who lead it to make progress on this and who is leading that charge? If the answer is "Nobody", why is that true?
Conferences already reverse discriminate by aiming for a gender balance in speakers (despite the submissions they chose from being very imbalanced). User groups have adopted CoCs to protect female and minority members. There are even female-only special interest groups. There's also this: https://github.com/nodejs/inclusivity
Besides, the list you're referring to is not an exhaustive list of important JS projects. It's a list of maintainers who have signed this open letter. What does their gender add to the conversation?
Inclusivity in programming comunities and JS/node in particular has drastically improved throughout the past decade. But structural changes take a long time to show results. The distribution you're seeing today represents what was being done in the past, not what is happening today.
This is like blaming the schools for poverty. Yes it would be wonderful if Node module maintainers were a perfectly representative blend of all the races, genders, religions, and orientations on Earth. The gap between that vision of Node and the one we have pales in comparison to the gap between that vision of Earth and the one we inhabit.