AA interacts with all controllers, it's just more noticeable on a Xim due to the higher degree of control with a mouse. The lower the sensitivity, the higher the pull of AA. It's a similar effect to reducing your in-game sensitivity, which isn't recommended on a Xim as the translators are built at max game sens.
AA can be both an ally and a foe, depending on the game, and sometimes it can be harder to break into the hitbox, or over/undershoot your target. Increasing sensitivity can reduce the tug of AA and make it easier to enter the hitbox at the cost of accuracy, whereas reducing it could lead to buffeting from AA.
It's not a criticism of this tut and I'll be experimenting with it myself, but AA is something to keep in the back of your mind when tinkering with sensitivity.
One thing we found with the Apex settings is that Smoothing may assist with AA, in a similar way to the Steady Aim Xim4 builds (though that's not Smoothing's intended purpose). RML previously invested a lot of time into fighting the AA bubble via ballistics curves on Xim4, but he apparently no longer uses them on Apex due to Smoothing.
Od1n and Headhunter and more qualified to talk about that, they have a much higher sensitivity to micro-adjustments than I do.