That seems like a pretty big leap. The original commenter left one short sentence. There is not enough information to conclude anything about intent. The context of the comment does not rely on gender at all. In fact, I see nothing in the article to suggest the person's gender in the first place. The only hint I can find on the whole page of the person's gender is the name "Julia" in the header, which, not personally knowing this person, could just as easily be a man's name as a woman's. It is reasonable to stick to generally accepted gender neutral terms, like "he" or "they", here.

Although, for what it is worth, even if this person is a man, I see no harm in using "she" as well. It's just plain not pertinent information to get the proper gender here. The message that it is referring to the original author would still be conveyed, and that is the only thing that really matters. English really doesn't care about anything else.