Sure the creators are women, but the trend which is rising regarding the games is about games targeting female audiences. Which is quite the opposite of advertisers preferring female creators, which is not taking into account the target audience.
It reminds me of savvy car companies in the 1980s who realized there was a huge untapped market for cars that appeal to women. So the best way to deal with that was to bring in female designers.
I'd imagine the effect is similar here.