Yes but your book example I would say is an entirely different thing, there is no way for the contents of the books to change whether or not you have opened it. However that does not apply to the choices of the characters, by you having control over the choices that Alexia and Rowan make you have the ability to mold them any which way. I would say that in these cases X is not present as a result of your actions, where as the contents of the book are static your decisions aren't. If you're playing as a straight Rowan then the potential for him to become gay wouldn't be there because of your actions, in which case he couldn't ever be considered as bisexual. Sure the option is there but if you never take it then how could that statement ever be considered as fact that would be in lore?
I apologize if my point isn't cohesive, wouldn't really call myself the greatest debator lmao