[citation needed]. Not because I doubt the number (it seems plausible), but because I'd like to see the data.
IMO once You factor for speed and environment (how much time will any of those electric city scooters ever ride on highway and/or above maybe 50-60kph?), You'll be left with two causes of accidents - rider who loses control (exponentially less deadly with reduced speed) and scooter vs car crash on intersections / in lanes. In this case, much as those crumple zones work well for whoever is inside the metal box, they also add extra mass / energy to the body that's being deformed on the outside...
IMO once You factor for speed and environment (how much time will any of those electric city scooters ever ride on highway and/or above maybe 50-60kph?), You'll be left with two causes of accidents - rider who loses control (exponentially less deadly with reduced speed) and scooter vs car crash on intersections / in lanes. In this case, much as those crumple zones work well for whoever is inside the metal box, they also add extra mass / energy to the body that's being deformed on the outside...