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...
More relevant is something like Japan. [2] They are currently losing 1 in every 200 people, every year. And that rate of decline is still accelerating. And they have a similar fertility rate to Finland 1.37 vs 1.42. The only difference is that Japan has had its low fertility rate for longer, and so it's closer to the equilibrium rate of loss that such a fertility rate implies, while Finland is closer to their older higher fertility rates.
[1] - https://www.macrotrends.net/countries/RUS/russia/fertility-r...
[2] - https://www.macrotrends.net/countries/JPN/japan/population
...in pretty much no sense of the word a "Western" country.