This was a horrific crash and a tragedy for the family of the man who died.
I think the AP issue is irrelevant. AP always comes on with a "keep both hands on wheel... be ready to take control at any time.." graphic. In my experience with AP (even the newest release) I would never let it navigate that interchange except perhaps as an active participant in a test during minimal traffic.
I'm more convinced, based on other TMC posts, that the gore-point barrier hardware was not in place and that is what made this crash so deadly. Based on crash test videos of the sort of barrier at this location, I find it incredible that the Model X would have sustained such damage if a working barrier was present. Anecdotally, from other recent videos posted and many Google maps excerpts, this location seems to have frequent impacts and is often awaiting barrier repair. That's my speculation. Sad event, regardless.