They gave up on permanent exclusivity a while ago, this isn't the first game they've let slip to Playstation. The rule of thumb is now that MS games launch on both Xbox and PC then go to Playstation after a year or so, Sony games only launch on Playstation then go to PC after a year or so, but never Xbox, and Nintendo exclusives are still forever aside from some weird China-only deals.

> Sony games only launch on Playstation then go to PC after a year or so, but never Xbox

Actually, Helldivers 2 was brought to Xbox 1.5 years after the PS5 / Windows release. But that's a live service game, so more players = a better experience.