While it sucks that it's not visible in the game, it sounds like they tried to write it in, but it all got cut because nothing sounded natural for the situation.
And I don't know much of anything about the game, but if more lines are written for these characters in the future, defining the characters this way up front gives them things to play with in the future. I guess if they did this without mentioning it now, people would complain that "oh they just changed him to being gay in the patch?!"
Also, I can't help but think that if they did make his gayness more visible, some would probably criticize it for being too on-the-nose, or over the top because either of the character's vocality, or their dialog wouldn't make sense in the context. I mean, I can't imagine a lot of people that would be happy with a gay dude shouting "YAAAAAS QUEEN!!!!" every time they kill a zombie.
I guess I feel like the two options here are "try possibly fail to deliver" and "don't bother trying," and I guess I prefer the first one.