Yup, saw Wilkins video earlier. If you autocross or race your car, then the stub axle is an inspection item and will need to be replaced on a schedule or at the first sign of pitting or cracking at the fusion weld. I've broken 2. One at an autocross which wasnt a big deal and one at Buttonwillow which almost became a big deal. A worn brake drum kept the wheel on the car after the flange broke in a 70mph corner. If you're running rear disks the wheel will stay in place but the wheel and tire will lock up, which is what happened to Wilkins. With drum brakes the wheel generally leaves the car.
As you can see, there's no warning when the failure occurs and it always happens in a corner.