Population control is often a dog whistle for ethnic cleansing. I think they are simply trying to be very clear that they aren't advocating for that.
"make family-planning services available to all people, remove barriers to their access and achieve full gender equity, including primary and secondary education as a global norm for all, especially girls and young women [1]
Which makes sense! Rather than some sort of authoritarian China-esque policy of limiting children, just spread access to goods (like education, contraception and abortion) which allow people to control how many children they have.