That's really impressive!
Key elements of good driving:
1) He uses the FULL space available of the track corners and is comfortable using a range of lines that suits the car through each.
2) He realizes the inherent understeer of the car, even on throttle, and manages the front tire grip limit very well through corners and places the car very well on intended lines while using most of the available tire grip and handling balance. He also recognizes this quite early on and adjusts his driving quickly to it. Even near the end when the rear tires start to get a little hot and the car will oversteer a little, he adjusts quickly and manages it well.
3) He bleeds off very little speed up to corners and is quite good at keeping momentum. He also seems to deliberately enter corners slightly fast and is willing to make small adjustments mid if needed or the grip isn't there.
4) He accelerates VERY early out of corners and even into and mid corner as available with the track space.
5) He has decent understanding of the track to know how to enter and come out of corners and can pretty comfortably manage car speed and placement through corners.
6) He is very deliberate in driving inputs. Short of inputs managing grip of the front tires and driving line, he applies very few actual inputs and extremely few corrections. Actions are very deliberate with specific intent. This is a BIG area that differentiates very good drivers from ok drivers. Even things like choice of application speed plays a role, not just the amount of input.
7) He is doing all of this while still driving the car relatively light. This is him maybe at 70%. He's not taking chances or doing anything wild or outside of the scope of what he can easily see. Even so, he still does all of the above well with low risk and clean, simple driving.
This is just really, really good driving.