Wild that the article goes on about the percentage of centenarians, then just has this brief note about how the data are completely unreliable, and never squares the two sets of statements.

The story is about the fact that the Japanese government is reporting these figures, and what the Japanese government has tried to do and believes that it still needs to do in response to its own figures. That it then goes on to cast doubt on the figures reflects on the Japanese government, not the BBC reporters.