They didn't, in fact, ban the use of the words.

From the article:

It is important to keep this guide in its proper context. The guide does not call for mandatory rules in schools barring the use of these terms. The guide is not calling for Father’s Day cards to be converted into “Happy Person with Testes Day.” However, we have seen such guides cited as the basis for sanctions, including allegations of hostile classroom environment or micro aggressive speech.

Headlines, headlines, headlines.