Does that make them a 'genuine' Jesus?
I suppose it makes them a genuine trans Jesus rather than a fake trans Jesus. And around and around we go!
If you wanted to know if someone is a genuine Christian, you would look at their beliefs, and maybe something like church attendance or whatever.
You wouldn't ask whether their beliefs are correct.
Now of course, some people want to insist that, "trans women are women".
But that's not my position.
Do you want to insist that we define "trans" as they really are the opposite sex in some sense?
Then we would just need to come up with a new term yes?