DolceFragola, your getting too hung up on labels and definitions. Yes different terms are used throughout history, but thats the case for everything. The essence however remains the same regardless of interpretation.
The problem with definitions is it can only define what is already known, and in this case, terms used today didnt exist before and the various cultures of the society's throughout history interpreted things their own way. However just because the term Trans is fairly new, it doesnt mean that trans people only existed as long as the term existed.
And fyi, male and female is included in gender variances, they are two options of many. Hence variances...
And by your logic, that trans people can only exist if they was assigned a gender at birth, would mean that if a law or the culture changed that stopped that process, trans people would cease to exist. That makes no sense. The essence of what trans people are is not defined by a protocol in hospitals. The essence that defines us is much deeper than that, on a genetic, hormonal, neurological and biological level it seems.
In order to gain true insight we need to look beyond labels and definitions