I'm really trying hard to understand your reasoning here.
Class 3 e-bikes, and indeed the whole class system, is a relatively recent invention. It isn't hardly surprising there is little to no data available on accidents since it takes time for governments to decide to track such things and the people reporting accidents would have to remember to note the class of an e-bike. Since many states still do not require the class sticker I'm not even sure how that would work, and I doubt it would work well enough to produce results that you could draw conclusions from.
Right now there is very little data about injury rates with regular bikes versus e-bikes, and what little data there is points towards a higher risk of serious injury. References:
The absence of statistics doesn't necessarily mean that there isn't a problem, or couldn't be. Simple physics tells us that higher speeds, even sometimes very modestly higher speeds, might well have a significant impact on injury rates.
Bonus: the second article referenced there specifically mentions in the abstract that higher-speed e-bikes (to 45kph) are correlated with increased risk of injury to the cyclist. Well duh.