I don't consider him or Diaz academy products any more than Aleix Garcia, Iheanacho, Sané or Jesus, they're just very smart transfers pulled off with a deal of foresight. While the club should get the credit for developing them as young professionals, the academy plays very little part.
Even Angus Gunn is stretching it a bit as he signed when he was 15.
The rags can go and poach half of Huddersfield's u-18s with senior contracts if they want to pad their stats, I'd leave them to it.
That's fine if you want to apply the same rules to everyone and write off all of those players, we're still miles behind the rest based on English kids signed before they were 15. There is no way you can spin it to make us look good on this.