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The Harvard/Von Neumann distinction is from an era before the modern break between macro and microarchitecures. It would probably be most accurate to say that modern ISAs present a Von Neumann macroarchitecture but actually implement it in a Modified Harvard way.

> Every modern machine is a Modified Harvard Architecture.

Well, this is just not true if you consider all modern computing systems rather than just desktop computing.

Every modern microcontroller is either Harvard, or pure Von Neumann. And there are billions upon billions of these shipped every year: ARM microcontrollers ship at a rate of 35Hz! Generally the lower power parts tend to be Von Neumann.

The AVR family of microcontrollers are Harvard machines. http://www.atmel.com/technologies/cpu_core/avr.aspx

As are many of the PIC series of microcontrollers.

Would you have other sources even for the term "Modified Harvard Architecture" ? I struggle to find others than this Wikipedia page.