Scooters are much cheaper than e-bikes. You can probably get two e-scooters for the price of an e-bike. They are probably closer to regular bikes in price. But regular rental bikes are less attractive to people with low fitness levels. Especially when they have airless tires.
Type 1 diabetes only accounts for 5-10% of cases so you can assume that the numbers most likely mostly come from type 2 diabetes cases. I agree that this is making the data more imprecise than necessary but not completely useless.