The only strategic point I see in that region is its close to a choke point where the Red Sea meets the Gulf of Aden. Any missle layout would almost have to be long range since there are no targets nearby. Wonder how many anti-ship missiles they deployed.
How about a sea lane to Israel
Actually, by doing this they would effectively control the Suez canal. And, of course, the tanker traffic that goes through it.
Couple that with control of the Straits of Hormuz, and you end up with Iran having a stranglehold on a significant amount of the world's oil.
Always assuming, of course, that this story is even remotely accurate.