That confirms it really. If you move forward to the junction on streetview, sightlines around that curve are not so bad, the driver should have had visibility a good distance up the road before committing to the turn. The car in front blocks vision slightly, but that’s the driver’s choice to follow closely and not wait until they could see properly.
As for the rider’s speed, yes, it’s clearly excessive, but if you drove around with the expectation that you’d never encounter anyone speeding or generally being a dick, you’d have a lot more accidents. Driver shares fault here, and hopefully wasn’t just given a pass because the rider was uninsured and had previous.