Hi babylon, I glad you like the game and I hope you have fun with it.
Thank you for pointing that out his/her, he/she etc. You are right that trans could use more emphasis in the book. While there is text indicating that any gender is welcome and that this should be clarified in advance at the table, I failed to explicitly point out fluid gender, trans gender etc.
At the time (the game is much older than the Trans Bundle), I did not have this sufficiently on my radar. I promise to do better for my next game.