before I started playing in the dirt, I spent several years playing in parking lots and road courses driving FWD cars faster than most people dared. FWD cars are known to understeer more than RWD cars because you can't use the throttle to induce oversteer. So when setting a FWD car up for competitive driving, I would do things to the rear to cause it to understeer less and sometimes even oversteer. I'd do that by taking traction away from the rear. I'd set the rear alignment to zero toe or even a dash of toe out. Street cars have rear toe in to promote high speed straight line stability. And at an event, I'd air up the rear tires to reduce their contact patch giving them even less traction. The result was a very nervous car. If I could keep the slip angle to a minimum, I would be very fast. If I couldn't keep the rear under control, I'd spin out or spend too much time chasing the rear to put down a fast time.
this guy even admits to having faulty test variables. In a straight line on a flat surface like this parking lot, new tires on the front all day long. But unless you live in Florida, streets have camber to them.
The only thing I agree with him on is 4 new tires are best.