It wasn't even a "brake check", as the brake lamp never illuminated.
The SUV driver kept their vehicle UNDER the speed of the passing cycle drivers.
The IDIOT on the motorcycle should have kept up with the average pace of the OTHER riders on their motorcycles.
The SUV driver was presented with an abnormal amount of vehicles around him, and many of them hitting their own horn button.
As a MC rider and SUV cage driver, I can tell you that if I was in my SUV and this happened to me ... there are going to be a lot of downed MC riders with torn up bikes.
As a MC rider, I can't ever imagine that decelerating like shown in the video in front of an SUV is anything less then my death sentence.