The statistic that 90% of casualties in wars are civilians don’t seem to be supported from what I can tell. It varies a lot but for example the civilian casualty ratio for WWII was like 67%. For the 2008 Gaza war the civilian casualty ratio was more like 74% (noncombatants) and 64% for the 2014 war (unless you only look at IDF sources, then it’s more like 40%). I can’t really get details on the 61%, are they counting all males 14+ as combatants? Even then it comes to 69% civilian casualties. I don’t see how they got to 61%, which is still very high for modern conflicts as stated in the article you linked.
This is what the UN article is referring to which I don’t understand why you think it shows that Israel is trying to reduce civilian deaths. What do you think Israel is counting as combatants? The numbers they claim only make sense if you think all males, including teen-age, are somehow combatants. Which makes no sense.
The conduct of hostilities in urban and other populated areas increased the risks of death and injury for civilians, particularly when fighting involved the use of explosive weapons. In 2021, 1,234 incidents involving the use of explosive weapons were recorded in populated areas in 21 States affected by conflict, resulting in 10,184 victims. Of these, 89 per cent were civilians, compared with 10 per cent in other areas. The highest numbers of civilian victims of explosive weapons in populated areas were reported in Afghanistan, the Occupied Palestinian Territory and the Syrian Arab Republic. 2 Civilians suffered devastating harm both in the immediate aftermath and in the long term. Many surviving victims of explosive weapons face lifelong disabilities and grave psychological trauma. The use of explosive weapons damaged or destroyed critical infrastructure, with reverberating effects on essential services such as water, sanitation, electricity and health care, and the disruption of food supply chains.