He redefined “transphobia” such that any accusation of transphobia against him would be laughable. In essence, he makes the argument that transphobia doesn’t exist and is a farce.

And to me, that’s transphobic in and of itself: categorically denying that it exists and asserting that any accusations of it against you are baseless.

As far as I can tell his definition of transphobia is being phobic of trans. That seems like the definition to me. You are the one expanding it to mean more than that.

Somebody who has arachnophobia is phobic of arachnids not entomologists.