To be fair it didn’t fall off a motorcycle. It was thrown (due to a hard bump) from a moving motorcycle. If it had been in the person’s pocket at the time because they had fallen off too, calling 911 would have been very fitting.
I guess the question to me is what the final false positive rate on this feature is. Its obviously a huge net win if the proportion is small - but if it is high enough I'd imagine that dispatchers would be less likely to want to send officers to the automated calls.