Clarification on Transgender Claims (good faith)

Tell me if I’m understanding the claims.

It’s that some trans people have an incorruptible sense of their true gender from the beginning, but the connection to true gender for other trans people is impeded and they don’t get the pure insight until later.

If this is correct, what is preventing the pure insight early on for the latter group? How come they don’t have the uncorrupted connection from the beginning?

Then, the de-transitioners would be those who thought they had the uncorrupted connection to their true gender, but later developed the uncorrupted connection, realizing their sex based gender is their true gender. Is this correct? Or do only the actual trans have a true gender?

Next, how can an outsider determine who actually has the incorruptible connection to their true gender and who is impeded and mistaken?