Are you saying that's a valid military strike, and therefore can't possibly be terrorism? Suppose this person is so successful he kills 1,000 and generals and numerous quit their jobs and move in fear for their life, just to really clarify what you're arguing here.
I don't think the analogy is apt. Members of Hezbollah do not occupy a positions of similar relationship to Lebanon as US generals does to the US. As far as I've heard, flag officers and others are escorted by personal security for an attack of any sort, such as the 2009 Ft Hood shooting. [0]
Moving past that, a civilian citizen of Venezuela in the US who performed actions against US military targets would not be a valid military strike since that person would not be an identifiable member or Venezuela's military. It would more akin to a spy or assassin. Below is an excerpt from an article representing a US-centric view of history [1].
But the right to kill one’s enemy during war was not considered wholly
unregulated. During the 16th century, Balthazar Ayala agreed with Saint
Augustine’s contention that it “is indifferent from the standpoint of justice
whether trickery be used” in killing the enemy, but then distinguished
trickery from “fraud and snares” (The Law and Duties of War and Military
Discipline). Similarly, Alberico Gentili, writing in the next century, found
treachery “so contrary to the law of God and of Nature, that although I may
kill a man, I may not do so by treachery.” He warned that treacherous killing
would invite reprisal (Three Books on the Law of War). And Hugo Grotius
likewise explained that “a distinction must be made between assassins who
violate an express or tacit obligation of good faith, as subjects resorting
to violence against a king, vassals against a lord, soldiers against him whom
they serve, those also who have been received as suppliants or strangers or
deserters, against those who have received them; and such as are held by no
bond of good faith” (On the Law of War and Peace).
0. https://en.wikipedia.org/wiki/2009_Fort_Hood_shooting1. https://lieber.westpoint.edu/assassination-law-of-war/
Edit: /Hamas/Hezbollah/
Obviously he must wear a uniform while actually conducting the attack though.
I'd understand if you were arguing against using excessive force, eg using thermobaric weapons in residential neighborhoods against an individual target, but there hardly exists a more targeted method than the pager attack / arson of specific houses.