Really, the wiki isn't a valid source.

However, in the season where they actually have appeared in episodes now, it seems Scarlet is portrayed as male, despite early images showing clear breasts. My guess is that Monty had planned for Scarlet's gender to be completely ambiguous and to give them a gender-neutral look. However, after he passed away, the team took Scarlet at face value and assume them as a male and made them more masculine when the 3D model was formed. That's the theory I have, anyway.