Are you sure about them being a woman? I haven't found any content or statement so far that would "reveal" their sex/gender. I'm not on the Discord server but even on the Patreon exclusive I have never come across anything relating to their sex/gender so far.
That's your personal interpretation of things, though.
And while it's not unlikely, it's not a fact either.
Unless HoruBrain (which already isn't exactly the same as "Horu" btw) confirms this, it's just a theory.
And even if they DID actually insert themselves as a phenotypic woman into their games, they could still for example identify as non-binary, which would not make them a woman, it would make them non-binary.
And if you're gonna tell me now that you only believe in two sexes and genders and nothing else (which is rude, but there are people like that after all), it might also be a phenotypic man who identifies as a woman and that is why they portray themselves as phenotypically female in their games, which (if you believe there are only 2 genders) by YOUR personal logic wouldn't make them a woman either (which again, rude, but some people do have this opinion).
You're just making bold assumptions here unless you can back this up by an official post from the creator.
Not that it even really matters, I just care about the games, and the games are awesome. But I think it's stupid to just assume their sex/gender when HoruBrain has NEVER stated their sex or gender or that they identify as female or consider themselves biologically female. And to go as far as portraying this as a fact, when it's just what people personally deduct from a ficitional character's name and the creator's name that aren't even identical is just jumping to conclusions prematurely.
While it CAN be interpreted to be a self-insertion, the name HoruBrain could, for example, also just as easily be interpreted as "the brain behind Horu" aka "I am the one who created Horu".
So let's just stop all the arguing and assumptions and just have some good old fashioned adult themed fun with these games, shall we?