That's a trailer, they aren't supposed to be representative of gameplay.
I feel sorry for Codemasters (well, developers in general really); fans have become so over-entitled now it's ridiculous. There's a huge section of the community complaining that the game isn't realistic enough while the other half is complaining that their name doesn't appear on the car or that the replay cameras don't match those at the track.
The game is far from perfect (very far), but it's fun. I've been on the end of a few bugs, mainly the three-stop tyres one and obviously 11/11, but the community has now taken it upon itself to become a QA team and search for bugs instead of enjoying the game. Either that or complaining about things that either can't be implemented or were never promised, trivial things that don't matter while huge bugs exist.
Their community is a first-class example of how the fans don't know what's best for them.