I can't speak generally, but looking at the court filings for this suit, it is relating to techniques for retrofitting stuff onto vehicles, so I imagine merely the installation instructions for comma.ai would be enough to tell them what they need to know.
I don't really know though, my eyes glaze over when I read patents and think about patent law.
How do they figure out whether stuff is truly infringing a patent in the first place? Surely some corporate espionage is required to figure this out?