As said the driver was charged, and sentenced for the offence. It is immeterial whether anyone on here thinks it was the bikers fault.
As death by careless driving is normally a custodial sentence, then the mitigation of speeding and irresponsibility of the motorcyclist will have been taken into account in reducing the punishment for the offence.
As for saying a Jury may have decided differently, the driver will have received legal advice from both a solicitor and barrister before making a plea. The plea will have been influenced by their view of all the facts and witness evidience. They would have had to be convinced that the jury would find him guilty before advising on a ple.
As with many things on here, we have not seen all the evidence, just the video and the accompanying narrative, to try and say that the driver shouldn't have pleaded is nonsense, as it is to try an put all the blame on him.
It's tragic, I have huge sympathies for the driver, and for the motorcyclist. I ride a bike, and when on it think all drivers are idiots, when in the car think all bikers are loons and keep an extra eye out for them. If there is anything to come form this, it is to think about other road users of all types when out, and expect them to do the wrong thing.