All the author did was say it wasn't a concern for them. Nowhere did they say it didn't matter.
This was a little bit more.
What is the point of this comment? Even if you had some way to know (EDIT: which you (https://news.ycombinator.com/item?id=12506075) point out is the case), why should it matter, especially since no-one else in this thread seems to have brought up gender?