This is NOT for corners. Keeps the car straight during a drag race. Do not put this on your car and carve a corner. You'll snap the end links in 2 seconds.
When you weld on a tube it bends the tube. using heat or weld is how a bent tube is straightened he just gave the car toe out which is not good (it screws up the handling) at all if he had welded it on the front side he would have given it toe in which is fine. A clamp on bracket with the tab on the top or bottom would be the best, I work in a machine shop is how I know.
I may have enjoyed the video IF you had shown the set up watch a good camera angle and a good video. This might as well have been taken from the street in front of this guys shop. It showed almost nothing but two guys talking. Not worth the time spent watching it.