Another Tesla owner reproduced the situation at the location of the recent fatality.
Watching the LCD display indicates the car loses reference of where the righthand lane markings are at 0:28.
The "gore point" painted on the pavement is missing the white line that should mark the right side of it.
It appears the car was using the stripe along the left side of the gore point as it's left lane edge reference.
Now why the car's radar did not detect the barrier is an open question.