The article does point to different career paths.
However, it also says that even within the same nursing occupations, male nurses make more than female nurses.
And yes, men and women choose different career paths, largely because of our different roles related to childbearing and caretaking. If women were adequately compensated for that (since reproduction is a necessary service to society and I didn't go to the uterus store to plan out what my role in reproduction would be), the inequality in male and female earnings wouldn't be such an issue. But such is not the case in the U.S.
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