This is just a facade. Xbox previously did a massive PR event when Final Fantasy came to Game Pass in 2019, they did the same for Yakuza, Persona, Kingdom Hearts.
The MS-Sega partnership has already been walked back a little bit, Metaphor is not coming to Game Pass day one. Judgment, Lost Judgment, and Ishin was not released on Game Pass. Even Peter Hines expressed frustration at not being allowed to release their games on PS (they still have financial goals to meet).
Saying that, Sony needs to catch wake up, and start communicating. There have been some moves made, they had a roadmap called Partner Consolidation, I wonder what happened to it.