Earlier quoted context omitted.
It's funny that many languages don't have this „gender vs sex“ separation. For example in my native language there's just one word to describe man/woman option. Some people try to bend over and invent new terms. That doesn't play well with claiming that somehow this „gender vs sex“ separation is not a new cultural phenomena.
Is Lithuanian your native language? Does this word not fit the defintion? https://www.techdico.com/translation/english-lithuanian/tran...
There's an attempt to call „gender“ „socialinė lytis“ (= social sex). But doesn't make it sound like it's anything beyond socially constructed cultural phenomena.