I do not agree with that definition at all.
It says that a hybrid bike mostly has gearing of a roadbike, although most hybrids have a 28-38-48 or similar crank, which is not found on any roadbike.
Furthermore it claims that a hybrid is made for the city ... I don't see any reason why this should be true and I haven't driven my hybrid through a city yet and hope I never will.

To me, the definition of a "hybrid bike" is much more simple:
"A hybrid bike is a bike that is versatile and up for anything ... it is not specialized for any activity but rather tries to find an equilibrium for being good enough at everything"

Exactly which components make up a hybrid bike doesn't matter I think, as long as the aim is to be good at many things at the same time: roads, tracks, forests, mountains, cobblestones, mud, night, day, rain, ...