So you’re counting every island and military ship inhabited only by Japanese military in this. Of course that would skew the numbers. If you look more specifically at military actions done in Japanese populated areas (a statistic that actually matches the current war), you’re going to find some horrifying numbers.
Times of Israel citing an IDF official as 2:1 civilians:combatants - bearing in mind any >15 year old male will be classed as a combatant too, even if they’re civilian.
https://en.m.wikipedia.org/wiki/Pacific_War - 1:2.5 civilians:combatants of Pacific theatre, if Wikipedia is enough for you.
So you’re counting every island and military ship inhabited only by Japanese military in this. Of course that would skew the numbers. If you look more specifically at military actions done in Japanese populated areas (a statistic that actually matches the current war), you’re going to find some horrifying numbers.