While I do think the parent commenter’s callout was unnecessary, it’s also true that if someone’s pronouns deviate from the norm, you’ll find them, meaning not finding them likewise has high signal.
In the absence of knowledge, you can guess or you can use the default ("they").
There are a few ways to read mpfundstein's post, and I was responding to those on the more charitable end, such as "I personally know the author, who goes by 'he'" or "'Austin' is clearly a dude's name".
