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Saito Kohei: Capitalism Lowers Birthrates
(mainichi.jp)
You don't happen to have a link to the full article do you? Fascinating stuff..
Socialism or Extinction has a good section on it (unfortunately it lacks a table of contents, but its all good).
I don't subscribe to Mainichi so I don't have full access either. It seems to be an exclusive interview too which is a shame.
There are many reasons for the lowering birthrates. Some are definitely caused by advanced capitalism, others are caused by societal progress.
The things that come to mind that contribute negatively to birthrates are radical individualism, rising costs of living, easier access to birth control, the emancipation of women.