The source doesn't use the term "misgendered", so that characterization may not be appropriate. When talking about the concept using the term is okay, but to use it as a verb in writing should be avoided per MOS:NEO, especially when the sources don't use the term. A neologism "is the name for a newly coined term, word, or phrase that may be in the process of entering common use, but that has not yet been accepted into mainstream language." It isn't in a lot of dictionaries (at least that I've been able to look at).—