Well that, and his comic book store sucks.
The store I go to has an entire rack/shelf/section for kids. On that rack is MLP, Lego, Minecraft, and a lot of other stuff. Options exist, that store didn't have them available and was probably just hyperfocused on what has traditionally sold, which is a shame because they lose the chance to pick up a new audience. If more stores carried it, the hope is more girls would buy them, and more of those comics would exist, the same way there are 8 parallel running Batman series all with women drawn to to appeal to the instinctual desires of young men.
Side note:
The author also seems to have a perception issues that is very telling in his expectations about comics, and fails to realize there are also a lot more in those comics that are reasons you wouldn't want your seven year old reading them beyond the way women are depicted (which is a point I agree with, I think its ridiculous too, and I don't buy those comics). There are a lot of themes in comics that are made for more mature audiences, the writer just sounds kind of ignorant of the media. He thinks "comics are for kids" for example. No, Archie comics are for kids. Comics haven't "been for kids" since the Comic Authority was still prevalent, he's at least a decade or two out of touch. It's almost entirely geared towards teens and young adults, you know, the ones with disposable income who drop $5 per comic. The lack of options sucks, but like most modern retail industries, the industry is optimized to stock/create and churn out what sells the most. Kids under 10 don't buy nearly as many comics as the 17-50 male who will walk out with 5-30 comics sometimes after pay day.
It's kind of like the parent that complains about the prevalence M rated games because video games are for kids. That medium changed a lot since they were playing Nintendo, or video games first came out and mainly only appealed to kids. Those kids grew up, and they still play video games/read comics, but they spend a lot more on them, but want more sex/violence/darker themes, so the market adapted because they want money. The problem is your comic book shop doesn't even stock the equivalent of a Nintendo games section for the younger audience. He's worried about his daughter, but he probably let his kid walk out with comics that are on the level of GTA, just because it was "Batman".
