Was that ever confirmed? I find it hard to believe personally the fee itself would suggest we were ready to throw him into a PL first team on his debut season... smells like bullshit. Even if it was none of that falls down... Martial was the same... there will be more to follow but feel free to delude yourself with this birthright/future set in stone nonsense. We also heard the exact same thing with Jesus... and he too could well turn out to be the Ballon D'Or king but the point is it's never that simple and you need a pinch of salt sometimes or you'll get carried away on the hype train.
Anyone around 18-22 right now may be good but have a looong way to go before being considered best in the world or on the level of a Messi or Ronaldo.
It was reported by most pretty reliable newspapers here and in France, I guess you never really know, but I'm not sure what more confirmation is really possible outside Guardiola or someone mentioning it if we were to sign him.
We spent £30m on Jesus after he'd played about 20 league games, and he was more than ready to come into the team by the time he got here 6 months later having really exploded after we bought him. I don't find it hard to believe Guardiola would have done similar with Mbappé. He sees talent and goes all in.
At the end of the day, I trust Guardiola and his staff to identify special talent, so if he says Mbappé is going to be the best striker of his generation, I hope the club backs him with the money to get that player here. It's made a lot easier to trust him when everyone's interested, and Jesus coming and making such an impact is similarly reassuring.