The article is a good read and has much good information. However, I think it makes a common error and confuses "telephoto" with "long focus" (long focal length). All telephoto lenses are long focus, but not all long focus lenses are telephoto.
The telephoto concept is a long focus lens that has the optics arranged to shorten the overall length of the barrel to about two-thirds the size it would be if it were a simple long focal length design (without resorting to catadiatropic (mirror) lens designs).
A great explanation is nontechnical terms. Well done.
Warning!! Handling a Hasselblad can be harmful to your financial well being!
Nothing beats a great piece of glass!
I leave the digital work for the urologists and proctologists.