To me its real, but there is still some little adjustment on the noise sound to make it focused more on the overall chanting and cheering sounds, those drumming and the shouting or singing on a uniform pattern will be more echoed on the microphones because everything there is being set up to the effect of microphone and they were all been set up to the best professional standards, the sounds are real, but studio edited as well to make the way of extracting the noise out of it, the aim of it all is not to confuse the players or something related, infant, when on the pitch, the players pay less attention to such except when they score a goal.
Totally agree on this. Due to the size of the stadium, they using some device to amplify the sounds of the crowd while drums is set to beat whenever an specific action is happening in the field like near on the goal to create an intense sound to boost player morale.
Football cheering is unique due to the use of drums just to make it effective on a very large open ground field. It’s the same with basketball court which they use speaker sounds to hype the crowd.