I wondered what made it specific to shotgun wounds, so I read the source article.
Jesus jumped-up Christ, Cory, you cannot possibly think that "shotgun" and "gunshot" are the same thing. I have read your fiction and I refuse to believe that you are that clueless. What the hell?
So, no, this is not for "shotgun wounds" in particular. The MedGadget article says it's for gunshot wounds in general; the manufacturer's page doesn't even commit that far, saying it's for "the control of severe bleeding from pelvis or shoulder wounds not amenable to tourniquet application."