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Nonetheless, female college graduates who were full-time wage and salary workers had median earnings of $809 a week, compared with $1,089 for men."
809 divided by 1089 = 74%. That's among FULL TIME WORKERS, not all women. So, the fact that 9 million women don't work is not relevant, because we're comparing apples to apples here, full time workers, to full time workers. Non-working women are not included in the data, as you allege.
Apples and oranges. Non-comparable jobs. Not my fault that women want to take stupid jobs.