While I don’t have any idea of whether the paper you linked to is accurate or not, and I am unsure about the Japanese government actually pushing any agenda like that. I believe that a much likelier reason is that the Japanese are trying to make sense of their low numbers compared to other countries. The example linked to in the video is especially dumb (I couldn’t look at it but I think I know which one you are talking about), but if you look everywhere there’s bound to be some reasons that seem to be causal but aren’t.