There is no doubt Iranians are involved, as no one else would have such capabilities in the area. But, this is a warning that they can hit with accuracy anything they want in the Gulf and around it. That includes US ships in the area, which would not be able to easily defend against cruise missiles guided by drones or drone technology on board. Remember, we shut down one such drone not long ago.......
So, the Iranians are no Iraqi army, they have technology and capabilities.