Technology: New Chainless E-Bike

I recently purchased an Energie Excursion folding ebike for my sailboat. It has an enclosed driveshaft. It is a lot friendlier and cleaner. That's important on a tiny sailboat.
Cool on the review. Actually this idea does not seem that interesting, sounds like hills kill it and it is another example of when an e-bike is not a that if the Battery is dead, then you go no where.