The point about not being terrorism but it being "Akumetsu" is what's really a lie. Also suicide bombing is also terrorism, the host pointed that out.
I believe the distinction Akumetsu is trying to make is the precision that differentiates terrorism and "an Akumetsu".
If a suicide bomber walks into a politician's office and detonates a bomb, he may very well kill the "evil" politician, but he also presumably kills several innocent civilians. The deaths of innocents is unjustifiable, so such a person is deemed a terrorist and "evil".
If, hypothetically speaking, a young man named Mario Luigione walks up to the CEO of a major healthcare insurer in New York and
allegedly puts a bullet into the back of his head, there are no indirect casualties. No innocents are harmed or, quite frankly, even at risk. Does that mean Mario is
legally in the right? No. But it does make it emotionally and ethically easier to justify Mario's actions if the CEO were committing heinous yet legal acts.
Minus the exploding head gear, we would then be seeing a real-life embodiment of the Akumetsu ideals: terror is not the goal but simply a byproduct of attempting to course-correct a broken system which has purposefully removed any legal means of fixing itself.