Hi @Capn_Carl. Ref my post 2 above this one in reply to your post.
See this thread which has just appeared and the cited news article:
The article states the police did pull the cars’ telemetry (more likely onboard data recorder, not really tele-anything), as part of their investigation.
Although this was a pretty spectacular crash, similar events occur nearly daily in most major metropolitan areas.
So digging into data recorders & telemetry post-accident is happening at least some. And IMO more all the time.