Neymar is not only a footballer but also a hardcore CS: GO player. He has repeatedly shown this on his Instagram.
Neymar is already very well known in the CS: GO community. The footballer celebrated the victory more than once or twice by playing Counter-Strike. It is known that Neymar has an understanding of the CS world, so during the last match, he made a celebration directed at Furia players.
Furia players were at that point in the stadium. The whole thing quickly went viral, because it is another example of how CS is important not only for computer players but also for other, completely unrelated environments.
Neymar and his CS: GO celebration
Theoretically, there is nothing amazing here, but as players comment, even such small gestures are important. They show that computer games are okay and that they can actually connect different worlds.
Neymar contributes greatly to the popularization of CS: GO and the gaming world. Sure, you need to know that taking the flag is a reference to the AWP, and not everyone present at the stadium is able to understand it.