Mbappe is surely not the world's most valuable player. However, by the statement that they claimed it is precisely referred to the kind of salary he receives now. I do not believe that a person becomes valuable if he/she earns the most reputed salary.

I also hate him, but he is the most valuable player right now. It's actually based on his performances, age, demands & availability. There is no denying that every clubs want his signature more than the likes of any other players.

I get what you are trying to say. You are correct in your way, but the media is also saying the fact. He is not on the same level as Messi and Ronaldo used to be but right now he has the most eye watering market value.