You misunderstood his meaning. He said that in the future, Japan can only support a population of 30 million.
In the past, Japan's industry had four pillars: automobiles, shipbuilding, machinery, and home appliances. Now we have taken away the shipbuilding, machinery, and home appliance industries, and are destroying Japan's last industrial pillar, the automotive industry. When Japan lost all its export industries, it could only feed 30 million people.
Japan is a country with very scarce natural resources. So Japan does not lack a population. Japanese people are very clear about their future, so they reject immigrants.
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