As a former competitive fencer, I found this article to be incomplete and a little misleading. Yes, if you refuse to bout someone in your pool you are disqualified. So USFA followed the correct procedure.
But the article does not mention that at some tournaments men and women fence each other. Fencing is one of the sports where muscle strength is not a deciding factor as to who is the better fencer. The article did not go into enough details on either fencer. Like how long ago and at what age did Redmond Sullivan transition, or what the rating of the two fencers where.
I think the article was written just to stroke the fires on the topic of transgender athletes.
Ellen