OK so I just read most of the description and this probably stood out to me more than anything. It is the example they give for this bullet. It would be easy to interperut this to a lot of our personal circumstances. How we presented most of our lives.
Many factors can impact the interpretation from any single person's writing. The content, knowledge of the material, age of the author, nationality, experience, occupation, and education level can all impact writing styles. For example, a woman who has spent 20 years working in a male-dominated field may write like her co-workers. Similarly, professional female writers (and experienced hobbyists) frequently use male writing styles. Gender Guesser does not take any of these factors into account.