So I would say the more technical term for your feeling is: nonsensical.
Hard to believe he was "afraid". More likely simply a gimmick to make it stand out (not implying negative by use of that word).
Besides I don't get this:
"My boyfriend Mark is way too much of a perfectionist to post his startup on HN"
He posted his startup on HN that is "marknadal" posted the link to his girlfriends video.
And what does being a perfectionist have to do with this anyway?
I've never dated someone who understands what I do so I relate to this but it has nothing to do gender other than I'm a straight male.
better?
I wonder if it's just safer in the tech online social scene nowadays to avoid gender and say things like "my partner" to avoid gender related trouble. A curious contrast against how we'd speak in regular life. Related: http://tomayko.com/writings/rest-to-my-wife
In short, you can't win with everybody no matter what you do. :-/
It's amazing how hard this is.