This is false.
As you said, women are underrepresented, which is a strong observation showing that it is tougher for women to end up in faculty positions. In addition, if you do a search, you will find that there are many blogs and websites that show how the current structure of academia and society make it harder for women to attain faculty positions.
Here are a few examples:
Tenure, She Wrote: https://tenureshewrote.wordpress.com/
Women in Astronomy: http://womeninastronomy.blogspot.com/
The fact that these resources exist means that it is not easier for women to get faculty positions. You will also find a lot of stories of how gender can unfairly affect your ability to succeed in academia. A recent example: https://tenureshewrote.wordpress.com/20 ... -a-family/
Other examples include actual male professors with sexist attitudes (at some places, you might hear some comments such as "women can't do math!" or "wow her math is really good for a girl" or outright harrassment at conferences or academic events) as well as unconscious bias (e.g. http://blogs.scientificamerican.com/uno ... t-matters/
I know I did not directly answer your question that you seem to be asking. This is because I think your question is misguided and trivializes the actual problems in academia. When examining hiring policies and procedures, I think it's important to consider all of the factors that affect the environment of academia and how that may be different for different groups of students/postdocs/faculty.