No a single estimation are near your number : https://en.wikipedia.org/wiki/Casualties_of_the_Gaza_war#Civ...
Most are about 80 to 90% civilian killed.
First, the article cite multiple estimations by different source.
Second, there is no logical fallacy, you on the other hand are trying to frame that unidentified body (by Israel) could be majority of combatants, disregarding that nothing prove this and that lot of them are women and children.
Third, you are only quoting IDF number and no other third party, this only quoting the perpetrator to defend its body count