They changed the app name and icon. It's not that big of a deal.
That happens often. What does not is an entirely new com bundle being treated as the same app: https://apps.apple.com/ca/developer/x-corp/id296415947
This should have required a new App Store download. What's next? Is it open season now for CCP spyware shell corps to start buying up apps that get automatically replaced without user consent?
I find it funny x.com was one of the six original single letter domains and now it's the only single letter Apple App.