whose fault ? opinions ?

[Slaninar]

The fact that the video states it's a pub car park suggests the rider is familiar with that road, and maybe should have accounted for that junction being there (and the possibility of traffic).

Agree with most other things you wrote, but this is faulty logic: rider fell and had more than enough time to see what's around him. The fact he knew it was a pub parking doesn't tell anything about the time he came to that piece of information.    ...I know, I know...