That’s only because of Sony. They’re the only ones that kept bringing up CoD - accusing, without evidence, that MS is going to make it exclusive to Xbox.
Phil Spencer / Microsoft only ever talked about CoD in response to Sony’s allegations - and that was to say they have no intention of taking CoD from PS and to offer long term deals as assurance.
And furthermore, to confirm that because they’re a distant #3 in the market, cutting off Activision’s biggest game from the current market leader would be a great way to cut off a big chunk of their new acquisition’s revenue.