It was made to celebrate Lewis Hamilton's eighth win (though controversial) at Silverstone which is why you see the number 8 at the beginning. Bahrain, Portimao, Barcelona, and Silverstone scrolled through at the beginning refers to Hamilton's wins so far in the 2021 F1 season. After loading, the 'game' then scrolls horizontally showcasing his wins at Silverstone throughout his F1 career. You might then ask yourself, "Hey, wouldn't the devs who made Gran Turismo be unhappy with this?". To answer that question, Lewis Hamilton is partnered with them. In fact,
the side of his cap shows the title of the series proving it, so the people at Mercedes most likely got permission from the developers to imitate the style.
For the controversy on Hamilton's win, it happened when he made contact with Max Verstappen (who is his rival for the championship). His rival ended up crashing out from the race while Hamilton carried on safely. Thankfully, Verstappen came out fine even though he hit the wall at a high speed. Despite Hamilton getting a time penalty for the incident, he still managed to win the race. This sparked anger among many people due to the incident to the point that some even said racist stuff to him over on social media. Disappointed, but not surprised. This is why I stayed away from various content relating to it or I'll get caught up in the drama. While I do understand the frustration from some people, stirring up hate is NOT the way to go. Personally, I have moved on from this drama, but some people just don't want to let go.