I think this is really the key thing here.
What NC was getting at in her questioning about immersive role play was that Sandie refused to play along so she had to go because, unless everyone went along with it, he couldn't compel people to believe he is not a man. Anyone who questions it is a bigot and must go.
This was a campaign to get her ousted, if chronologically he only referred to her refusing to work for him after the Xmas eve issue, it acts in the favour of the C because it is evidence of him trying to oust her.
It's all about wrong think and not wanting others to wrong think (speak).