When? It was JUST at the Microsoft conference under "console launch exclusive" IE timed exclusive.
Early access still means it isn't exclusive. Can I play it on Xbox one? Yes.
Your use of "Exclusive" seems odd. Why does it being optimized for SX matter - if it is on Xbox one?
Then why put it under "Xbox Series X:" it isn't.
Your thread title suggest PS5 vs XsX. Your List says "Xbox Series X:". Yet your response weeds out things like "early access" and "its being optimized" and then "its first party". To fix your Thesis.
Is this Xbox vs Playstation, or Xbox Series X exclusive vs PS5 exclusive?
Official Statement on the exclusivity of The Medium:
As exclusive games for new consoles, I consider all the games that will come out after its launch (and I assume that will be the case for Grounded and Gears Tactics). Early Access doesn't count for me.
Zelda BotW was an exclusive WiiU and Switch game. It's the same with Halo Infinite, Gears Tactics and Kona (PS4 and PS5 timed exclusive).