An executive in an American military contractor that is providing data analytics to the IDF joking about war crimes. This attack could not have been planned and executed so successfully without Palantir's services and they are gleefully celebrating their involvement without explicitly saying so.
I don't think they targeted Hezbollah specifically, it's just that pagers are niche enough that they could rely on probability to get some Hezbollah members. Turns out plenty of civilians like doctors and emergency workers use pagers too, so to the IOF it does double duty as terrorism.
I can only speculate but probably intercepted during shipping, or if the whole Hungarian shell company thing is true maybe planted there.
Totally guessing here, but it wouldn't surprise me if Hezbollah has some kind of regular contract for bulk ordering, in some manner.
They probably run through plenty of pagers, and need regular replacements.