Yeah it’s basically like a launch option that will configure it in a certain way. You can in fact with a launch option tell the game to ignore this, and play split screen on Deck. I have seen people doing it but I doubt it runs well but I guess that’s the beauty of PC/Deck gaming that you can do whatever you want to and make up your own mind.
Of course yeah. But more often than not PC isn’t factored in when something is called exclusive or not because honestly PC and Consoles aren’t in competition in the same way consoles are with each other.