On what basis? Believe it or not, MS is in a good relations with a lot of companies out there.
They're even on very good terms with Sony but don't tell the console warrior fanboy extremists this, they will swear to Hell and back it's not real.
Anyway I also think there's some truth to this rumor. I wouldn't be surprised if MS are doing something with both MGS and Silent Hill if the Kojima rumors turn out to be true (and there's indication those are pointing to something). It'll be funny if this turns out true because the only other MGS/Silent Hill rumors we've heard have been from Moore's Law Is Dead who has insisted on rumors of a MGS remake by Bluepoint and something Silent Hill related, both tied to Sony.
Granted, when it comes to console-related stuff I don't trust MLID all that much as he seems to be a bit of a fanboy himself (those leaked DMs between him and RGT showed a bit more of that IMO), and some of his earlier rumors surrounding PS5 features kind of backfired when the APU x-ray die shots leaked. That plus, there isn't too much circumstantial evidence pointing to either of those rumors being true (or he might've confused some things; maybe instead of MGS, Bluepoint could be working on a SOCOM remake?).
Eh, we'll find out in like 45 days anyway...maybe.
Microsoft was always fully invested in gaming. The idea that they werent is revisionist histroy. If they werent fully invested they wouldnt have burned through billions of dollars in losses and who knows how much in money hats and exclusive timed dlc. MS has been in the industry for 20 years and every Japanese game be it exclusive or otherwise has spectacularly bombed, never took off, or almost killed the franchise. Japanese devs have been down that road before and they know where it ends.
This post of yours is what reads like some revisionist history. There's making investments and then there's
making investments; Xbox as a division was never necessarily a priority for Microsoft at large, even during the 360 era. They poured money into it, surely, but they never viewed the division as anything having a use or impact upon the other sides of the company. During the Xbox One era, particularly post-2015 and up until 2018, they were clearly cutting back allocated budgets (which not only affected rate of system production manufacture and allocation of costs for QA testing of certain games) and cancelling games outright.
What they're doing with the Xbox division today is quite different compared to the other three generations, because now the main sides of the company are looking to both support and benefit from developments within the Xbox division. Even though Xbox as a division is still rather small compared to the rest of the company, they are starting to treat it with a sense of importance similar to how Sony has treated the PlayStation division for the past decade. The only difference is that unlike Sony, the lifeblood of Microsoft is not dependent on the success or failure of the Xbox division...that doesn't mean they aren't giving it a strong play this time around, however.
Your take on their relation with Japanese studios makes absolutely no sense considering almost all of the major Japanese publishers have strengthened their ties with Microsoft thanks in part to the GamePass platform. Various Japanese games are seeing a lot more success on the platform, such as the Yakuza series, and you would think if Japanese companies as a whole had such a derision to Microsoft then companies like Tango Gameworks would've tried their hardest to get out of Zenimax to avoid being acquired by Microsoft, and notable devs like Shinji Mikami would've left upon said acquisition.
Neither of these things happened. Your post is a fantasy that has no basis in reality.