This very well may be fake, but it’s also entirely possible to identify as trans for any number of reasons. You might say such a person is “not really” trans but, supposing that is true, there’s no contradiction between that and some person who doesn’t have such ideological convictions having a thought process like you see in this image and acting on it.
That said, I agree that it’s probably fake, though I’m not as confident that the poster is a cis impersonator.
You can’t tell in the movie but in the script, all his lines and stage directions are written in greentext.