The N900 shipped two years after the iPhone while still having a resistive touchscreen. In the story of Nokia resisting Apple and Android it's basically irrelevant - it's part of the history that led to the N9, but it's not until we get to the N9 that there's a meaningful response to the market shift they represented.
Resistive touchscreens get a lot of criticism but even back then that was partly down to Apple propaganda which caught on because people were used to cheap screens with rubbish resistive sensors. The touchscreen on the N900 was good: high resolution, rigid, fast, accurate, sensitive enough for fingertip use.