All of that does not make it an illegitimate target under international law. If someone shoots your friend and runs into a building and you strike that building, you cannot claim that you got that target until you see a body. That’s just how assessments in a Western fires process work. It also provides more legitimacy when you do say something.
If you can come up with a more valid way to conduct assessments, by all means provide it. Israel wants to assess their targets as much as you want them to.