No, the g-boxx is a Honda product. Nicolai uses a Rohloff gear hub. The g-box was just an enclosed deraiileur, the rohloff is an actual gear hub with 14 speeds.
I know damn well what's inside Nicolai's box. And I know Honda's G-cross bike used and enclosed derailleur. Since the bike was called a "G-cross" bike the bo in the frame was a "G-box".
SWEEEEEEEEEEEEEEET!!!