Currently Online 
Windows Central came out with their own update on the matter as well:
"Additionally, we've been doing some digging of our own and can confirm that the list of "changes" outlined by the above forum aren't based on any current plans within Microsoft and amount to "speculation or guesswork," trusted sources suggest.
However, it's no secret that Microsoft is actively exploring "changes" to Xbox Game Pass, which could include some of the guessed ideas outlined in the forum post.
Our sources say that there's no current plan to remove "day one" games as a feature of Xbox Game Pass Ultimate in totality, but like the statement to Paul Tassi says, changes are coming. But, 100% speculatively and analytically: I think it's probably worth expecting that more franchises like Call of Duty may be pulled from day one access even on Xbox Game Pass Ultimate."
You called down the thunder, now reap the whirlwind
