If you thought this was too good a deal to be true, I guess Microsoft agreed. A short excerpt:
"You can no longer claim a trial of Xbox Game Pass for £1/$1, just days ahead of Starfield, the year’s biggest Microsoft launch.
“The option has been removed from Microsoft’s Xbox Game Pass sign-up website (thanks, XGP). Now, you must simply pay the full amount for your first month.”
$9.99 for a month of gamepass PC, or $10.99 for console (ultimate you’re paying for cloud access or online play, so it’s a disingenuous comparison) You can play starfield for a month, then buy it for 20% off through gamepass, so $55.99. $55.99+10.99 = $66.98.
So you basically get a $11 month-long trial, then $2 off the full price if you decide you like it enough to keep.