I think this is all that needs to be said on these articles.
(There's a lot more that _could_ be said, such as how few actual birthing HN readers there are, but I think the economics is really simple at the root of it.)
Besides, even the countries with really the worst outlook and conditions aren't falling all that fast. Russia since the high point of the 1990s: https://www.worldometers.info/world-population/russia-popula...
In fact only Lithuania, Latvia and Estonia of the Northern Europe countries are showing a long term decline.