no? why does that matter?
i think the bottom line here is that the only way defend the statement "iran has killed more americans than any other terrorist regime", is to carefully define "terrorist regime" to exclude a bunch of elephants in the living room, like al qaeda, nazi germany, imperial japan, fascist italy, and (i think) even the taliban. it's basically inventing a category so you can make iran sound like the worst enemy we've ever faced.
it's similar in spirit to when the announcer says "this hitter bats over 0.700 with runners in scoring position on the first tuesday after a full moon".