Exactly the type of person you shouldn’t listen to if they say this.
If they instead give you some pointers of things to work on. Thumbs up to them. But that statement they gave you is utter nonsense.
I suspect he blew smoke up and couldn’t get you to diamond, because in reality, that’s not where your ability is right now.
That’s not to say it can’t be. But if it was, you’d already be there.