I think there is still something there, but it's more subtle than it used to be. Running the mouse along a ruler does deviate along the X-axis (I haven't tested Y), but the variance seems to depend on mouse velocity and movement vector.
In some tests, it was dead straight. In others, it'd look like a U with a dip, then a rise towards the end of a 360. In others, it'd dip and keep dipping in one direction, and rise in the other.
What was previously happening is it'd dip and keep dipping to the left until you hit the ground, and the opposite when moving right. The turn speed was also all over the place. Turn speed is reliable now, but something's still not quite right with right stick movement.
I probably wouldn't notice if I wasn't looking for it. I'm not finding it to be problematic in-game and it's much easier to correct than the previous ST. Turn speed is great (it was off in the last XSX ST with weird acceleration) and I'm landing my shots without any trouble due to D2's AA and bullet magnetism.
If I wasn't a filthy casual, it might bother me. The Xbox One ST should work fine, but I'd be checking the turn speed, which is now much faster.