Here is the definition of the classes from the article:
Class 1 e-bikes use pedal assist up to 20 mph (32 km/h), Class 2 e-bikes can also use a throttle up to 20 mph (32 km/h), and Class 3 e-bikes can provide motor assistance up to 25 mph (40 km/h)
Class 3 does sound more like a motorcycle to me and not like a bike.