Developers getting SDK late explains why we didn't see any series X gameplay until so late. This seems like a pretty reasonable explanation why the Series X versions are not performing to the level we were expecting, even digital foundry is puzzled why the game is underperforming so much compared to the ps5 version. It simply doesn't add up. Yet, when this simple explanation is brought up, Sony fans will deny it(of course). You don't need to be an Xbox fan to find this whole thing strange.
Yup they having a field day on Twitter. Sigh.