I would suspect/guess that the integrated sway control in the truck does more to mitigate sway of the truck than it does of the trailer. Unless it actually applies the trailer brakes to a greater or lesser degree than what the IBC would do in a normal braking event ?
One way to find out is to get it out on a wide deserted road early some sunday morning, and do some violent swerves back and forth at a reasonable speed. I did some testing like that when I first installed my BlueOx swaypro hitch.....and I can tell you that I "opened" all the drawers in the camper doing it !