This can be easily and summarily dismissed if you know anything about minimum population numbers. Humans will never, through simple declining birth rates, reach the low-or-sub-1000s numbers that would result in there being too few humans to maintain genetic diversity.
https://www.livescience.com/minimum-people-to-survive-apocal...
> how many people would it take to keep our species going? The short answer is, it depends.
> "With populations in the low hundreds, you can probably survive for many centuries. And many small populations of that kind have survived for centuries and perhaps millennia," Cameron Smith, an adjunct assistant professor in the Department of Anthropology at Portland State University in Oregon, told Live Science.
What the article is really just arguing is that scientific advancement relies on larger populations, which, cool story bro. Having more kids in economically or ecologically untenable situations just to keep new tech being sold, is not a serious argument that people who are choosing not to have kids are going to be receptive to.