As they have been saying for ages….the issue is the delivery system.
Getting the materials to implode on a target is the key. I guess you could make a bomb and deliver it in a truck or ship. But it is likely that the radiation coming from it would be noticeable from a distance.
Certainly, Iranian missile tech is not at the stage to deliver this kind of weapon.
I would be most concerned with some type of dirty bomb delivered in a container.
In any event, it appears that the increased stories about this stuff portend an attack by Israel or the US. My concern there is that a bunker buster bomb is going to create a dirty bomb effect in some Iranian city. That kind of mistake would backfire on Israel.