It's a little disingenuous for Franz to claim any credit for Nichimen. Nichimen N-Graphics was the spinoff of the Symbolics S-Graphics system, written in ZetaLisp. Symbolics ceased new development and there were customers for the graphics system, so it needed to be ported to a Lisp environment that would run on available hardware.

Franz Allegro CL is a further development of Maclisp, developed during Project MAC at MIT. ZetaLisp was also a direct development of Maclisp. I'm guessing this shared ancestry helped in the software porting and made Franz the natural choice for the N-Graphics. But the press release just blows a lot of smoke about the speed and scalability of Franz.