I'm sure Pogba has told him that months ago, but that's never going to make news because it's a private conversation between the player and his agent, and neither controls the other. Also, it doesn't create drama so the press ain't hearing a peep out of it.
I just don't buy that Pogba is speaking through his manager or his brother, these are people who make their own decisions and Pogba is a hot topic for all those around him, family members will speak for their own without thinking of the fans or ramification, it happens all over the world with all kinds of players and it always unfairly puts pressure on the relationship between player and coach/fans/teammates.
I hope he stays, but some of these toxic fans don't deserve to see a functioning Pogba-Bruno midfield. The vitriol against a guy that is a class act and professional is disgusting, and even worse so when they try to pretend as if he brought it all on himself. He gets criticized if he posts too much on social media and then if he doesn't post enough about the club. The debates about his hair styles, dancing, being called a virus when we all know it was the pot calling the kettle black (and worse, some fans eating it up from the toxic one). The fact is, the team is turning a rough corner, and I think Pogba's first intention was always to come back to United to make the club great again. He might have ambitions to play in Madrid in the future (or even now), but I think it's still more enticing to him to stay and achieve success here before he moves on.