Earlier quoted context omitted.
As long as we are going to share the same internet, we can acknowledge that the use of the masculine as the default gender for an anonymous person is a longstanding tradition in the English language, and not every person checks every byline of every article she reads. Norms are changing, but I wouldn't call someone wrong or sexist for using a convenient idiom instead of more awkward and somewhat forced modern formula…
Norms will only keep improving if people keep complaining. Here's an article about the forgotten tradition of they as a singular pronoun: http://news.ycombinator.com/item?id=723184 Also, because of the he, I assumed Ixiaus was referring to Gary Shteyngart, the author being reviewed.
This may be controversial or offensive, but it's the truth so I'll take the heat for saying it:
None of the most successful women I know really care or complain about things like he/she in the English language. For the most successful women I know - I'm thinking of an investment banker, lawyer, and chief editor of a magazine in particular - the idea of causing a fuss over pronouns is so low on their radar that it wouldn't happen.
Again, I'll take heat for this, and so be it - but I think people who complain about that sort of thing need to go do more relevant stuff in the real world. Most people who are actually hard working, enterprising, expansive and successful (professionally or in other worthy endeavors) simply don't have time to be upset and pedantic over this sort of thing.
Anyway, I'll take the heat for this now. It's not 100% the case, but the general pattern certainly holds.