Slop.

I think that one was kind of an overblown internet outrage situation. The system of sexuality was implemented in a very hacky, jank way and was mostly intended to create a reasonable looking average result, where men and women typically ended up together but sometimes formed same gender relationships.

I actually think his comment from the time is a pretty interesting contrast to his current view on AI:

People tend to think of game characters as people, but they’re not. They don’t have internal experiences. They only have outward behaviors, and they are totally defined by those behaviors, because that’s all the player can see, and the player’s POV is the only one that matters.

His point here is that there was never any such thing as a gay, bisexual, or straight Rimworld character. There were characters who presented to the player the illusion of having these identities through the patterns of their relationships, and that illusion was upheld by some jank code that could be read as treating all women as bisexual or gay if you choose to interpret it that way. But none of that was ever player facing and therefore wasn't part of the illusion intended to be presented to the player—again, in that illusion, most women appeared to be straight.

I'm not saying the code was good or shouldn't have been implemented better, just that I don't think the dev was trying to communicate anything with it.