The author concludes by helpfully pointing out that the above article is not written by a security expert and thus should not be relied upon for serious security matters without additional study. She chose a lighthearted and slightly deprecating, "I'm just some hacker chick" to do so. It's pretty normal for a blog. Try and picture a slightly different scenario: "I'm just some hacker dude." In this situation, it's very likely that you wouldn't have looked twice at the sentence and would have skimmed to the end of the article without any concern whatsoever. You wouldn't have bothered to post about how the article should just say "hacker" without any further qualification.
That's called the status quo. What is "normal" doesn't seem like a personal or political bias, but it is. It's the slightest reinforcement of that status quo. A little bit every day. Something that strikes you as different might seem as an affront, but in reality it is no more than an inclusion of another person's perspective that hasn't been exposed much in the culture. It's not better or worse, it's just different.
You can test for this. In this case, replace "chick" with "dude" and see how it looks. If it doesn't appear to have an agenda that way, then you are just running up against an internal bias.