There is some truth in Cisgender as a term, just not the truth that the trannies, their enablers, and the #groomers in our schools so desperately and violently demand that normal, mentally healthy people believe.
The truth is that “Cisgender” is merely a term coined in 1994 – in a tranny Usenet group! – specifically as an antonym to the already flawed term, transgender. The truth is that Cisgender is a term meant solely for their use to make trannies feel less abnormal than they are.
So, there is some truth in the term, Cisgender. It’s true that it has exactly zero basis in science. It’s true that is was coined as an in-group shibboleth and coping mechanism by sadly and severely mentally damaged individuals. And, it’s true that its current misuse and overuse is causing irreparable harm to a number of people, all for the sociopolitical gain for the depraved and disgusting sorts who profiteer off of minority groups of all stripes.