You might notice I never once promoted any such depopulation ideas, simply that the natural negative growth trend as a result of highly educated populations is a good thing that we should not take any action against.
We need less people, we don't need to make the number of people less: it happens on its own.
If it were possible to make a nondiscrimatory policy against growth then that would be great, but we already saw attempts fail in places like China which resulted in skewed demographics. In 1994 in Cairo the UN met and decided the best answer was simply: Educate Women.