So sorry about the month of silence, midterm season happened, then final season came right around and hit us in the face with a truck. Please enjoy the newest chapter before the holidays!
AFAIK Kou has always been referred to with gender neutral and sometimes feminine pronouns. I believe the scanlators, in some of the earlier chapters, chose to use male pronouns in place of the gender neutral ones because they thought doing so was a bit more natural in dialogue.