Actually, they don't specify who gets quoted a higher price initially, they just say it was different.
Based on the dealer's quote, it seems he starts higher if he expects more negotiation from the other party... are men or women more likely to try to negotiate more?
Also, they only talk about the initial offer, not the final price the car sold for.
Overall, a pretty weak article. They need to provide much more information. Just knowing that some group got a different initial price than some other group is kind of meaningless.