Do you think MS still wants to be in the consumer OS market?
It's low revenue, fairly high expense, and the relevance of "which operating system do you use" is going down rapidly (see linux gaming getting good with MS's help). Businesses.. sure they'll keep using windows and paying for it, since they already have a huge amount of legacy systems/software and IT procedures/institutional knowledge - like IBM still doing mainframes - but consumers don't seem to care about that.
Most people basically seem to use their computer to run a browser, maybe some games, and maybe some office suite stuff, OS doesn't matter too much anymore.
Honestly I don't see any evidence that Microsoft wants anything. Every little fiefdom within Microsoft wants their own thing and no one cares about what is good for the company as a whole. There is at least one team that just wants to sell as many games as possible, and are no doubt looking at SteamOS as potential platform to target.
"The division owns intellectual property for some of the most popular, best-selling, and highest-grossing media franchises of all time, including Call of Duty, Candy Crush, Warcraft, Halo, Minecraft, and The Elder Scrolls."
Your point was that Microsoft "gives a couple of hoots" about which platform Gamepass is on, implying that they specifically care about making Gamepass not accessible on Linux. Them having a guide for Gamepass access on Linux proves the opposite.
But you're just nitpicking looking for an argument. So, goodbye.