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>Is it really so insulting that she didn't say "girls and boys"

Agree. There's nothing in the article that even suggests that this phenomenon only applies to, or more often applies to women.

The "to all the girls" part is clearly due to the fact that the article is written by a woman and posted on a site mostly directed towards women.

EDIT: It looks like the article's been edited since it was originally posted, and that it used the wording "this experience applies to women (...)." I still don't think this is a major issue since the article was meant to assuage the concerns of someone who's experiencing impostor syndrome, and again, the article is written by a woman and posted on a site mostly directed towards women.