Appreciate any critique to improve or learn from this
There's really not a lot here. It's a bomb that can be reused, and that's pretty much it. There isn't really any story or intrigue, and the article has a lot of pretty simple mistakes, as outlined in my line-by-line. I think you should try to develop a story for this piece, who made the bomb? Why? how? Who had it before the Foundation got to it, and how did they get it? These are the types of things that make up an interesting article.
Also: I am really not a fan of using thermonuclear blasts for a skip. It is literally impossible for a nuclear warhead to explode anywhere on earth without at least a dozen countries knowing about it immediately. There is nothing confidential or subtle about nukes, so I don't think they really make a lot of contextual sense for the Foundation.