To replace the word cissexual with the word normal in that sentence would have changed the meaning of the sentence, so the two words are not synonymous in that

To replace the word cissexual with the word normal in that sentence would have changed the meaning of the sentence, so the two words are not synonymous in that context. Also, the author is a man who started out physically as a woman. He is not cissexual, and is aware of the terminology and uses it, and I don't think that using a wide vocabulary indicates some fear of other words.