Hmmmn.
I have no desire to sound like a know it all here but. The turns do not seem to be the problem on this course. Please notice that the turns are "over banked", making any exit from the course unlikely. The problem is the speed carried into the turns. They are higher than what most of the competitors are accustomed too. The result is "over cooking the turn".
This results in some cases in exiting the turn "out of shape".
The area coming out of these turns are where problems will occur. Watching the video will confirm this. As the competitor exits the turn is out of control, a physical barrier keeping the athlete within the course should be present.
Ice will allow the athlete to slide to relative safety. Leaving the course exposing the athlete to comparatively less harm. Broken bones and concussion.
Someone goofed here. And it has cost a life.
If I were in charge, I'd retrofit the course with barriers that would minimize the eventuality of a competitor leaving the course.