The article may technically be true. Its simply that the author has seemed to immediately link the word "submarine" with either the words "Boomer" or "Hunter Killer".
It is not unusual to find mini subs or remotes in commercial docks, they are used for maintenance and or research. Ask BD Popeye I am sure he has seen plenty of one sort or another over the years.
What is it though with these guys
you get the the impression that theya re the kind that empty an entire Uzi clip into the undergrowth, every time they hear a mouse.