That makes it an electric scooter then, not a bicycle since the primary power on an e-bike must be provided by muscular power. That's the way it is in Ontario and I am happy with that definition and the special treatment I receive under the law because I pedal.
Keep in mind that the law in ontario is not the law worldwide. Many places outside ontario do not define an "e-bike" in terms of what the "primary power" source is. Even if they do, people in will continue to ride without getting exercise, on e-bikes that work when you pedal without actually contributing any power, or work without any pedaling at all. I don't think that the exercise aspect has much to do with the reasons behind vehicle laws-- much more relevant is a vehicle's ability to do damage to people other than the owner (which is what liability insurance is all about) and that is a factor of speed and weight.