It'd be nice to be gender neutral :)
While talking in a context of a specific post, written by a male?
Since the specific context matters to you, would you now suggest the parent of this thread then change the pronoun to "she" instead?
Answering your question: would he, or me, or other poster know the gender of author while writting about author -> we should use proper form. If no prior knowledge is present: it does not matter to me, and I consider it not worth mentioning or correcting.