I could write a cut and paste statement as a refutation of yours..

Lets try something different. A few decades ago, homosexuality was removed from the list of mental illnesses by the psychiatric community. So using the "diagnosed by professionals" as a back up to current or beliefs from the recent past does not work.

Your quote "Body dysmorphia is an anxiety disorder based on a distorted view of how they look. " is exactly the definition of being trans. (I posted the same before, and it was removed, which is why I trimmed it, and started with "lets' try this again").

What they see in the mirror, is not what they believe in their mind.