[Tonytitan]

... but I take the phrase “mobile launchers off its east coast” as very serious.

You are taking this to mean that they are using ship/sea-based launchers, and I don't think that's the case at all. To me it reads that they are launching from land-based truck launchers off their east coast. I've not seen it reported anywhere that they have a sea-based launch capability.

[TigerLikesRooster]

I think you are correct.

[broncobilly]

On second thought, you may be right.