^ That is a correct judgment, as it should be.
It's on the rider's video that the car turned in front of the motorcycle - violating the motorcyclist's right of way, regardless of the speed of the bike. The car driver should not have done that, and was properly charged and convicted for it. The evidence is plain as day on video. "Careless driving" doesn't necessarily mean a sustained period of improper behaviour ... a one second inappropriate decision (turning in front of another vehicle that has right of way) is enough.
It's also on video that the rider was travelling at excessive speed ... but it would serve little purpose to lay charges against a dead person.
Keep in mind that legal definitions of "careless driving causing death" etc are not necessarily the same between different countries.