They could test the AI features and still could disable it for the official release, just to test it, it does not mean you have to roll it out to the official release in September
So your argument is kinda weak, even if it’s in alpha status, they could enable it in dev beta ! They did this with some things in the past already, do not remember which feature it was, but they did this already in the past, testing some things and disable them before official release, eventually bringing it back in the future.
So Apple intelligence will likely be available for a short amount of time in dev beta I guess, maybe if we’re lucky it will released in RC but with the label „beta“ on it.