Yes, it’s true that they don’t have to choose while they are children. And of course I didn’t explain that it doesn’t always take 10 years for PR because you could use the point system depending on your situation, and also that the Japanese government doesn’t investigate whether people are dual citizens as long as they keep it a secret, but the government could in the future if it really wanted to, so you’re still gambling, etc.
In other words, obviously it’s a complex legal landscape, and my main goal was to expose the complete failure in focus in the original article and illustrate some of the starting points about the actual issues for those who are not knowledgeable about Japanese immigration law.