From another article I read, this is a nuclear-powered sub, that is one of a handful that has been retrofitted from ballistic middle duty to cruise missles. So basically it’s a cruise missle platform. The headline is playing a little fast and loose for effect.
Also worth considering that subs that launch nukes are assumed to be out, patrolling in enough areas to ensure last-word MAD deterrence, so you can just assume that US nuke-launching subs are already able to strike most major population centers and don’t need or want to broadcast their specific location (unless, like, a very intelligent former president specifically puts their location on a new broadcast for clout)