I don't know. Just because the pigeon-toed yee gee kim yeiung ma looks like something a woman could do more easily doesn't have anything to do with why we stand that way or how it originated. Stories about Ng Mui and Yim Wing Chun need to be looked at as instructive parables and essentially as the creation myths of our system rather than as literal truth. Looking at the stance and arm positions and then then jumping to conclusions about the sex of the style's founders is nothing more than speculation. And pretty improbable speculation, IMO.
In the known history of WC going back at least to the time of Leung Jan in the mid 1800s, all the masters of WC were men. And virtually all recorded Chinese boxers in general were men. The female heroes and villains of wuxia novels and legends from Hua Mulan to Yim Wingchun not withstanding, the cultural norms of the times did not allow for female boxers and warriors.
In the known history of WC going back at least to the time of Leung Jan in the mid 1800s, all the masters of WC were men. And virtually all recorded Chinese boxers in general were men. The female heroes and villains of wuxia novels and legends from Hua Mulan to Yim Wingchun not withstanding, the cultural norms of the times did not allow for female boxers and warriors.