McEnroe is right. The snide tone of the article is unwarranted. What he might have mentioned is that a woman who plays a great rally game (Martina) would do much better against men than Serena once they got used to returning men's heavier serves. 

"McEnroe won seven Grand Slam titles in his career. Williams has won 23." 

Because McEnroe worked his can off and honed his talent to play against some of the greatest players in history, while Serena did a whack of 'roids to hone a consistent 200 kmh serve the other women couldn't hope to return.