If men evolved to be bigger and stronger, as measured in some peak power output, surely there's a price on that? The candle that burns twice as bright burns twice as fast as the saying goes.
Also, the article is mainly about one woman. It mentions that the gap has narrowed but in order to have any meaningful analysis we'd need more stats.
Also, many, many people run marathons. So narrowing gap makes sense due to increased participation rate and better training; men and women aren't that different, on average. The extremes though are where differences truly manifest themselves.