While all modern ICBM models adopted designs which allow to store them for long times in silos and launch them quickly, nothing forbids use a different design (i.e. liquid fuels, external launchpads) to carry and deploy a nuclear warhead - as the first models ever employed.
If Iran had abandoned fully and truly its nuclear program, maybe the "satellite" explanation would be more credible. Also, the base name doesn't convey a sense of peaceful aims....