I suspected the guy was full of it:
Why the "Out of Control" Prius Driver Is Full of It | PriusChat
Besides the obvious issues of putting the car in neutral, turning it off, etc. The one thing that still stuck in my mind is this: Is the Prius' engine
really powerful enough to overpower the brakes? Lets think about it, brakes on most any car are powerful enough to lock the tires up (assuming you don't have anti-lock brakes kicking in) no matter how fast the car is driving. But, how many cars have the engine power to cause all 4 tires to burn rubber? And at what speeds? Do you think the Prius could burn rubber if you floored it at 20 mph? No way, never happen. But the brakes are certainly capable of doing the opposite. So even if this guy was legitimately trying to stop the car with the brakes, why wouldn't the brakes be sufficient? Well, the video above certainly proves my point. The guy is full of it.