I'm interested in the wider discussion around
How? You aren't listening to any response.
The only way you can know what being trans is is if you have a baseline of information. In this case what the starting point is, what is being transformed from and into.
If you can't even accept that human beings are either make or female then you have no baseline, nothing to transform into or away from.
So, using your logic, no trans people do not exist. But, by extrapolation, neither do males and females. We are all something else...