It isn't? Are they talking about Big Wheels?

"Reinforced" polymide is what most people call reinforced nylon. It is that tough but flexible stuff that the base of your bicycle saddle or Look cleats are made of.

I imagine the reason that they are looking at the Ebike market is because it is such a rubbery, inefficient material that only when used in a motorized bike would anyone find it acceptable. This is not a material that is even used to make ladders because it doesn't have the strength to weight ratio or rigidity necessary for longish spans.