I always considered the person that was talking about all their dives, experience, c-cards, skills, etc. and then gets is the water and dives almost vertical, silts the whole place up, has no buoyancy control, etc a stroke. I didn't think it refered specifically to DIR. George Irvine's definition doesn't specify DIR either. Maybe it depends upon the context.
Unsafe diver or unsafe attitude I consider a stroke.
Unsafe diver or unsafe attitude I consider a stroke.