Demographic collapse as a risk (and related risks related to declining populations) deserves to be explored from a non-racially/religiously motivated angle. Just because some racially/religiously motivated groups care about a problem does not mean that everyone who cares about that problem is racially/religiously motivated.
We also don't argue in the document that people should NOT be having kids in certain countries, nor do we argue that certain groups should not have so many kids. We don't even argue that people in general should have more kids (having kids is not for everyone). We merely attempt to take a sober approach to issues around population decline and potential solutions.