Considering the bleedingly obvious political slant fueled by feel-goodism, especially towards the end of the article: No. This is just another make-readers-angry hit piece.
Among many egregious errors and ignorances: No, the LDP has not "ruled ever since". There have been a number of times the LDP was not in power, including most recently when the Fukushima #1 power plant underwent a meltdown because the Democrat Party (not to be confused with the LDP) government at the time was utterly inept.
Rivers are "walled with grey concrete" because to not do so means the rivers flood uncontrolled during the rainy seasons leading to washed out towns and villages which fucking nobody reasonable wants. The coasts are "blighted by tetra pods" because high tides, waves, and fucking tsunamis are commonplace.
Japan absolutely faces many big problems as it moves forward, but this article serves to help precisely nothing. The author might as well have wasted his 10 years in Japan if this is truly all he could write.
I read it and did not get angry.
The LDP has been in power since 1955, except for two periods (1993-94 and 2009-12). That's roughly 61/67 years.
> rivers flood uncontrolled during the rainy seasons
Not all rivers flood, but almost all have been lined with concrete.
OP's article definitely reminds me of some of Alex Kerr's writing (a good interview at https://www.kyotojournal.org/kyoto-interview/concretizing-th...). He defined some of the issues facing Japan, including the concretization of coasts and waterways.
Incorrect: it's 1 year if you score 80 points on the point list for the HSP visa, and 3 years if you score 70 points.
As far as I can tell, Japan has the easiest and most permissive immigration policies among developed nations, bar none. Compare with the "pro-immigration" US where there's strict limits on worker visas, H1-B holders have to leave the country very quickly (a week?) if they lose their job and can't find a new sponsor fast, there's strict limits on green cards (PR) with a lottery of all things, etc.
Regarding fertility rate, I don't know the projections for the younger generation, but 27% of 50 year old women here have never had children. It's hard to convince the remaining women and their partners to make big sacrifices to have three or more kids in order to make up for the perceived freeloaders (the never-married ~28% of men and ~18% of women that have no interest in each other).
Without the government somehow brainwashing the population, any real solution would likely result in opposition from large parts of society, so the can gets kicked down the road...