I am fully in agreement that the apology / retraction was not necessary and the power that the TRA have is insane.
However, and I'm thinking out loud here... there are physical characteristics of trans people that would be pretty hard to 'special effect'. You wouldn't use extreme make up etc to turn a female actor into a male character unless it was part of the story.
So eg the voice of a transman or transwoman that's been altered by hormones is quite a distinctive timbre.
Actually I am struggling to come up with any other examples! Facial hair on transmen is easily fixed with effects, boobs on transwomen ditto.
But ultimately they would need to use actors who were the same sex as the 'birth Sex of the character otherwise it would get insanely confusing trying to work out what's going on!
I think I've just talked myself out of that argument!!