I think people are looking at this out of context because of people like playing favorites.
He's saying that even a legendary game release can't turn around the current issues that are preventing Xbox from being able to outsell Sony. We already knew this based on their problems about stock and a declining retail presence since some developers would rather go all-in on gamepass than print discs.
Starfield could be an 11/10, it could be a 20/10 game, and it still wouldn't change the needle because there's not enough consoles out there for a 20/10 game to sell enough to catch up. Sony had 6 months of shipment improvements and now has a ton of consoles out there to buy. The only thing Microsoft has with similar progress is the S, but because the S is very different than the more powerful X unit, there's many people who won't touch it. If Starfield could sell 10 million S and X each, and its a legendary 30/10 game, there would still need to be 10m of both consoles out there to buy. i don't even think there's 2m out there to buy right now for X.
People are looking at his speech as if he's saying that there's nothing he can do and that Xbox is going to coast from here on, but what he's really saying is that there currently isn't a path to catch up in consoles sold and he's 100% right, at least for now. He even included Activision in that deal because even if the deal went through and there's even higher demand, that won't move more consoles for Phil to out console Jim, if the consoles aren't there.
Whether or not Phil will push to change that or not is the only real question. As of now i am not seeing any changes.