GDP goes up. Productivity goes up. More money is being made as | The End Times
GDP goes up. Productivity goes up. More money is being made as women enter the workforce. But this extra/new labor isn't being paid for by that productivity or extra gains, it is being paid for by men's wages.
If a man earned 100 and you thought women entering the workforce would mean man+woman=200, you were wrong. Man+woman=100, if that.