Manufacturers usually design their products to fulfill the purpose they advertise them for. "Our revolutionary, next generation driver training aid! "
I would suggest that medicus designed their Dual-Hinge Driver as an aid not in order to strike a ball.
They specifically say the PowerMax is a hittable club "The PowerMaximus™ is the only hittable weighted driver ......"
There's great peril in "tugging on Superman's cape," but there doesn't seem such a fine line between training aid and non-conforming club. I don't think that we should concern ourselves with what the advertising says.
If it has a clubhead and a shaft - no matter how goofy - the device should be called a "club." (I'd be willing to exclude some child's toys and some novelty items.)
If it has a clubhead and no shaft or a shaft and no clubhead or no clubhead and no shaft it cannot be a club and thus should be called a training aid.