I'm SURPRISED you have dash cam. Mine LOST the 30-60 before the hit. Seems to be common with fuse blowing with airbag deployment.
This is obviously the other persons fault. I would hire a respected injury attorney. I've done it several time. Not that you want a $1M payment. Just repair / replacement, Medical, Loss time / FTO use w/ work, minimal pain suffering (you have SOME pain). The big thing is they handle everything with the other guy, your insurance, etc so you don't have to stress over all the details and there WILL be a LOT.
Totaled? Varies. My insurance company, Allstate, totaled my 2020 w/ 1500 miles on it and "reluctantly" issued me a check for me than I paid for it to cover full replacement value even though that kind of policy isn't offered in my state.
I the fact that they advertise full replacement value on their website. There have also been lawsuits that Allstate paid out for false advertising of replacement value.
The fact that replacement cars had a 8-10 week day I'm sure factored in as "comparable" were HIGH at the time.
I also brought my personal local agent in on the claim (not everyone has this) and said I would up my policy coverage and add umbrella policy if he fought for me on the car value. I needed to do this anyone due to increase in personal income, personal worth, etc.
Allstate specifically told me "ANYTIME the airbags go off we total the Tesla".
Personally I thought it could be repaired and for FAR less than they paid me. But it would have also been months to get all the parts and repair it, plus all the storage fees, and retail car.
In MY situation it would be totaled and it was.