That very well may be true. There are several variables involved.
When I purchased my bike new I noted that the belt did hug the outside of the pulley. Never gave it much thought and figured the rear wheel had to be perfect from the factory.
I needed to replace my rear tire but before I loosened anything up, I measured the rear wheel position and found the axle was .030" further forward on left side than right side. The max allowable per HD is .030" from right to left.
Installed a new rear tire and made a special tool to align rear axle to within .005". That is to say my rear AXLE is true to the rear FORK to .005". (Not saying my rear wheel is true to frame or true to front tire within .005". Just saying rear axle is true to rear fork within .005")
Now when I roll forward, I can see metal on each side of the belt. It is no where near dead center tracking but belt no longer hugs one side lip.
.025" in axle shift did make a difference for me.