I don't understand what that is supposed to show, as neither car kept on the throttle as far as I can see?

Each time one car passed the other, the other car didn't seem to be still accelerating . It "looked" like he would accelrate hard, then back off as the other car did a "fly-by" - there certainly didn't seem to be any proper foot held to the floor - "you're going to have to work hard for this" type action?

Especially the Lambo, each time he accelerated off, you could see him slow down before the Supra would even go past, then as soon as he had, the Supra backed off . What does this prove?