Interesting video. He raises the correct question. Why make this flight? Terrible weather, night , heavy turbulence, icing, single pilot. Why not wait till the morning? If history is any guide in the am it was VMC.
Reno has big hospitals etc , hard to know what SLC has that justifies this move.
An astounding 50% of life flight operations are pre scheduled patient transport.
Where I live, in the mountains, there is an astounding number of life flight helicopter moves for non urgent care.
We will likely never know why that flight was made.
Very sad.