I'd sure love to know more about the "suddenly and without warning came to abrupt stop" part of this claim.
Seems frivalous but most of these cases are just lawyers looking to blame an outright accident or user negligence on a company with pockets.
https://www.cyclingweekly.com/news/cyclist-sues-e-bike-brand-rad-power-bikes-after-sustaining-injuries-in-crash