I know that location pretty well. There are side-by-side HOV lanes. The left lane enters an up & over bridge to head south on Hwy 85. The right continues south on 101. It seems likely that this driver was traveling at high speed, either realized they were in the wrong lane, or were not paying attention and drifted into the collapsible barrier[0]. They'd have struck the median barrier from the end. It's about a foot wide concrete. One factor in this type of accident is that the X is much heavier than the typical auto (5,500 lbs for Model X vs. 3,500 for a Camry for example) and at high speed would have collapsed the safety barrier with much more force than it was designed to absorb, thus destroying the front end of the vehicle.
I'm speculating, but from the video, that appears to be what happened.