The essence of terrorism is the attempt by non state actors to change government policy by the use of random violence to instill fear in the general population.
Blow up a plane and demand that we stop support for Israel.
Blow up a building and demand we close bases in Saudi Arabia.
If a nation-state did this it would be considered an act of war.
So no, the nuclear option is not a terror tactic. It is a legitimate bargaining chip. Used by nations when negotiating with other nations.
I have no issue with you. I have issues with your argument.