The Xbox Chief of Finantials Operations said that their strategy with Bethesda was not going to be to keep their games exclusive, but instead 'first on or best on' their platform. That means multiplatform and timed exclusivities.When did they say Starfield will be a timed exclusive?
If he wasn't lying, we saw multiplatform games but no timed exclusives, what should mean that the games announced as exclusive (Starfield and Redfall) would really be timed exclusives. So yes, it would be exclusive but maybe for a year or maybe two. Something that due to marketing reasons could be announced time after their original Xbox/GP release.
They also explained to the regulators that to keep their big games exclusive doesn't make financial sense and that is the reason of why they say they'll keep them multiplatform (but I assume obviously they'll keep some game or timed exclusivities for them, and I assume that the ones with more chances are the new IPs).