@JOL Someone already posted a link to answer that question. The simple answer is : it did not impact those stats because they use an other register than the one missing 230 000 centenaries to measure life expectancy. And even if they did, the impact would be small as 230 000 is still not much compared to the population of Japan (well, I'm not so sure I fully understand that part as I'm lacking some knowledge on how life expectancy is measured)
The link in question : https://www.demographic-research.org/Volumes/Vol26/11/26-11.pdf
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@JOL Someone already posted a link to answer that question. The simple answer is : it did not impact those stats because they use an other register than the one missing 230 000 centenaries to measure life expectancy. And even if they did, the impact would be small as 230 000 is still not much compared to the population of Japan (well, I'm not so sure I fully understand that part as I'm lacking some knowledge on how life expectancy is measured)
The link in question : https://www.demographic-research.org/Volumes/Vol26/11/26-11.pdf