As I noted in my summary, this would be an incredable leap in Iranian missile technology, one that the US has only recently attained. I think that this is mostly bluster and big talk to scare the arabs across the gulf into thinking that the Patriot missile systems are no longer effective and they are defenseless. Thus increasing leverage to have them pressure us into not striking their nuclear development facilities.
OPINION: I read your summary. I do hope it is "mostly bluster and big talk."
Time will tell.