It's terrorism if non-combatants are the target. These attacks targeted combatants who were being sent information to conduct combat through the very same devices that exploded.
This is actually insufficient, unless you think the bombing of Berlin was terrorism. If your attack is about primarily about reducing military capability then it isn't terrorism.
Bombing a tank factory staffed entirely by civilians is not terrorism. Launching an expensive cruise missile against a single apartment block is probably terrorism, but if that apartment block houses all the scientists of the Manhattan project, maybe it's not. Bombing a military base isn't terrorism even if you end up killing all the families of the soldiers stationed there.
1. all the devices will land in hands of legitimate targets
2. all those devices will be actually used by targets at the moment of explosion
3. there will be no civilians in the range of explosion
Because of that civilian casualties should be anticipated at unknown scale. Since Israel pulled the trigger knowing that, it means they deliberately targeted civilians along with legitimate targets.