Even the very slanted wikipedia article doesn't claim such a crazy thing: https://en.wikipedia.org/wiki/Casualties_of_the_Gaza_war
They do claim everyone under the age of 18 to be a "child", which I know is the UN definition, but is pretty absurd in this situation with Hamas fighters of 15, 16, and 17 years of age being very common.
In contrast, for the purposes of this thread, it is irrelevant that "Russia is doing exactly that systematically for years now, disguising as civilians" (to quote you).
This isn't a contest to see how many negative things we can say about the Russians or the Israelis. Or at least that is not a coversation I would be interested in.
I think Israel's actions since Oct 2023 have been deplorable and disgusting. But that doesn't mean I am interested in no nuance at all in discussing how deplorable and disgusting.