Simple. The creator officially announced that it's the final version.
Hell, If they say "It's official, I wanna spiky needle's ZaryaAndTracerThinkTheyAreBirds Edition is the final version.", then that ZaryaAndTracerThinkTheyAreBirds becomes the final version, unless they make a new version called "PainisCupcakeEatsSomeone Edition".
Well, This is an absurd example, but final versions are entirely on the game's creator.