The UN has been very clear about the rights of the child, and child soldiers are universally classified as victims regardless of whether they are armed or affiliated with a militant group. Israel isn't actually allowed to carpet bomb child soldiers under international law.
Stop trying to frame this as the health administration trying to create confusion. Children are classified as civilians, period.
Also, wanna know something extremely fucked up? Half of Gaza's population is under 18 and 70% of the population are under 30. The fact that Hamas uses child soldiers is shaped by the fact that Israel created conditions where boys can't expect to live long enough to even become men.