Do you have any sources at all for your assertion “This was very probably the most precisely targeted large-scale military strike of the last 100 years”? It is hard to engage with your statement in any reasonable fashion without knowing where you are getting your information.
Just start from the premise that Israel targeted exclusively handheld military comms devices that would in ordinary practice only be in the custody of Hezbollah combatants, and from the additional premise that the explosions in the strikes were relatively small, so small that the overwhelming majority of the Hezbollah casualties were wounded and not KIA. Then try to make another story make sense.
We have significant evidence for both these premises!
This is not an argument that the strike incurred no civilian casualty, that no child of a Hezbollah combatant was in close proximity when one of the bombs went off, anything like that. It's rather a sanity check on arguments based on statistical claims about the casualties. There might have been quite a lot of civilian casualties! But for there to have been significantly more of them than combatant casualties, I would argue that you have to break one of my two premises.
Here is an excellent and HN-worthy writeup of the argument for legality, and the counterargument that it was an improper booby trap.[1] It seems to me most of the polarizarion on this board could have been avoided had the original article recognized (as does the one linked here) "that the legality or illegality of the pagers attack can only be determined on the basis of a detailed factual analysis and that the relevant facts are still not fully known."
I disagree with @dang's decision to leave the original link up, as it is nearly valuless in framing this discussion.
[1] https://lieber.westpoint.edu/well-it-depends-explosive-pager...