I've tried googling various iterations of gemini, claude, AI and gay and not seeing much suggesting the AI characters are supposed to be gay. On the other hand, would it have made sense in the context of the article for it to say "the girls and the guys"? Wouldn't they just say "human characters" or something similar to refer to the whole group? Or maybe "guys and gals"? Also, some women get offended when they're called "girls," especially when men aren't being called "boys," so one explanation for why they risked it in that sentence is for the playful, sort of rhyming, "girls and gays."
Also, for the record, I have the Siri on my phone set to "Australian man."