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English is a fluid language. The original commenter could have even correctly used 'Buhurah' instead of 'He' if most people would understand that it meant the author of the article. Although, unlike 'He', which is commonly used to refer to people of all genders to the point that it is recorded in modern dictionaries as such, 'Buhurah' is likely to leave people confused as to the subject matter.

The fact that you were able to successfully recognize that the person who used 'He' was specifically referring to Julia Evans without having to question that person means that the message was conveyed quite succinctly and the subject was perfectly understood, which is correct from the perspective of the english language.