They claim they're worried about trade secrets. It's just as likely there are some emberrasing details related to the crashes or elsewhere that Waymo is concern

They claim they're worried about trade secrets. It's just as likely there are some emberrasing details related to the crashes or elsewhere that Waymo is concerned will make them look bad. They are fighting to keep it secret, so by their choice all we can do is speculate. Companies stretching the definition of "trade secrets" to hide uncomfortable information is hardly unprecedented.