Obviously it was excessive speed.
I read that he was airlifted to hospital. Well good it was only him and he didn't hurt anyone else.
He fucked up on that turn, look at the video, he lost traction on the right turn just before the hard left. You can hear him skidding then he turns hard left hoping to make the turn, no no.. going to fast.. right through the guard rail.
https://youtu.be/oOQL7hyFXtc?t=4