That sounds a bit boring and generic, especially coming from the cannibals in the first game. Let's hope it's not something that boring. I wouldn't trust a 4chan rumour on this.
I don't mind a revenge story, but a revenge story against a cult of homophobes in a post-apocalyptic setting, seems like the most dull thing ever. Remove the zombies, put it in a Rambo 1 like context, then it's a good revenge story, asking questions on how society treats people, mental health, etc. A cult of homophobes would spend time going after the small percentage of gay people that might be found in various small communities spread around a big area? Nah, calling this rumour fake. Wouldn't even say something interesting about "the last of us", like the first game, so definitely calling fake. More so, focusing overly on her sexuality would just dull the game down further. Was the focus of TLoU, Joel's heterosexuality and Ellie's homosexuality? Nah, it was barely a part, mostly mentioned as context of their relations to people.
Such a contrast would be like going from Rambo 1 to Rambo 2. Rocky 1 to Rocky 2. Going into more typical campy ways.