It seems pretty transparent that your colleague is looking to put fault on the car rather than his own driving abilities or the weather.
I have not heard of Tesla releasing that kind of information, nor other car companies. That said, auto manufacturers obviously can and do use data to defends themselves when they see fit.
A subpoena would possibly work if a suit was filed. It could be a costly affair though and I would imagine that it is likely not to demonstrate fault on behalf of the vehicle beyond reasonable expectations. That could backfire as well and lead to needing pay for their legal fees.
I will say that driving the SR+ has been a lot of fun and has a lot more punch than I think a lot of people assume. With it being RWD, I also feel like that plays a role into sliding if you accelerate into a turn. I have been impressed at how well it adjusts to that so far, but in bad enough conditions (slippery/muddy/greasy) I could see that yielding pretty nasty results. This is my first RWD car, but I would assume that these are true of any RWD car, and certainly came up in looking into how it handles snowy conditions.
Glad to hear that they are relatively okay.
Do you think any of the safety claims by Tesla come into play in terms in reducing his injuries?