" tubing diameters and tube thickness since this increases the shape factor..... Very simple."
Isn't that just increasing dimensions, how is that a shape factor? Changing wall thickness as a ratio, or changing from round to square is one thing, but just using bigger tubes just sounds like a dimensional change. Often when tubing diameter is increased in bikes the material used retains the same wall thickness so the dimension increases, but the ratio of wall to diameter decreases which is an inverse change in shape. Still stiffer overall because the stiffness increases to the cube of the dimensional increase.
I have no idea about the specialty terminology, however.