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.
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.