No. Blowing up Suleimani with a predator drone was not an assassination. No. Blowing up Saleh al-Arouri with a drone was not an assassination.
Assassination requires a scheme or subterfuge. It's creeping up on someone or setting up for the perfect moment. An entire military department directing a distance strike at a convenient moment is not an assassination, it is an act of war.
Assassination is ALSO generally an act of war but the method and context is different.
assassination should be narrowly understood in the modern Marxist context that Lenin defined it in, we shouldn't call ancient groups like the Hashashayin "assassins"