"I didn't even look at any other than just the one, and saw it was neu dick.shun.airy revisionism.
The word "gender," like "sex," originally referred to that determined by genes and sex organs.
"Gender" as referring to self-identitfying began in the late 1970s.
The word "cisgender" was coined in 1994. Most people to this very day never even heard it.
I understand for a child like you who grew up after these additions came to be that they seem legit in the web bubble you inhabit, but to the rest of the world they're about as totes legit as a groovy happening that will no longer be def, yo, in a few years.
But I'm sure you'll be just as jizzy about their Tumblr replacements, hep cat.
Keep on truckin, toots."
Ah, right. You're under the impression that things only pop into existence when they are named. That might be the case in whatever fantasy games you play but it's not how things work out here in reality.
Trans people have existed as long as there have been people, that means that cis people have too. Cis people are in the majority so as is our social tendency, the minority group had a term first.
I was around long before the term cis but I'm not so fragile and insecure that I feel threatened by it. It's a useful term that descibes someones gender, hardly a buzzword.
It sounds like you aren't too familiar with how things are outside your fragile, insecure social group but people have acknowledged the existence of more than two genders and the difference between gender and sex for a really long time.
You not having heard of something or a white dude not having written about it didn't mean it wasn't common knowledge elsewhere; sorry to burst your bubble.