If there's just a 4K mode...can I still run it on my 1080p TV and have at least all aliasing gone due to the downscaling?
I'm not sure what people think when they ask this question. Do they think the Pro will lock them out of the game if they don't have a 4K TV? If you have a Pro, and the game has a pro patch, the game will automatically work for you in the pro mode regardless of what display you have.
So to answer your question, yes.