Yes it is, see https://www.britannica.com/topic/terrorism
> terrorism, the calculated use of violence to create a general climate of fear in a population and thereby to bring about a particular political objective.
They want to push the non-Chia in Lebanon against the Chia, probably hoping for an organisation like "Phalanges Libanaises" to come back and restart the civil war. If a new civil war start, it will be the second Israel deliberatly started in lebanon (yeah, the "Phalangistes" did the massacre, but the Mossad actually planned it and gave the target (mostly palestinians btw). This time it will be harder though.
No, it's not. We don't have to twist the definitions of prohibited acts of war for a war to be deplorable. Legal warfare is still horrendous.
> random children killed because Hezbollah militant were shopping/walking nearby, really 'precise'
To be clear, if those same targets were hit conventionally--by air-launched missile, for instance--that would somehow be better?