Those were definitely great examples of his hype coming through.
For me I'd say a little earlier even; beating Moya at 16 years of age on clay, strong performance vs. Hewitt at AO 2004 where he was hitting amazing forehands already, beating a red-hot Fed at Miami 2004 already showing brilliant tactics and then his great win against Roddick at Davis Cup 2004, even if it was on clay. From there it was a matter of time. And that time was very short as it turned out.
Heck, he was really close winning his first HC title in Auckland at 17 years of age that year, dominated to win his first ATP title at Sopot on the clay...