The OECD report shows the risk of rider death per trip on motorcycles or mopeds is five times higher than that for e-scooters.

I would think that the relevant statistic would be death per unit of distance traveled, not per trip. If the typical scooter trip is much shorter than the typical motorcycle trip – which seems very plausible, given range and speed limitations – then “per trip” and “per unit of distance traveled” statistics could differ a lot.