Question on the elements and associated planets

I’m not sure if I’m reading this wrong. But I’m reading the complete works right now. I’m on Evoking Eternity and was reading chapter five. The second page is talking about the planets and the elements. Why is it different then what I have read in the past such as North Air Moon Neptune and Uranus? I know for the fact that the moon is water. So am I just miss reading it or miss understanding something?