I think it makes sense to have a range extender on a motorcycle. I've had my Rav4 Prime for a couple weeks and I love it not having to worry about charging all the time. The charging infrastructure is still pretty crappy, doing long trips with a hybrid is much less stressful than a straight EV.
From that article it sounds like they want to use the electric motor and battery to create a boost for the motorcycle. It's similar to Honda's IMA hybrid system. It would use the motor to regen and create a boost in power for the ICE motor.
I know they were working on some kinda hybrid gas electric motorcycle