The burnishing ball is smooth, it re-forms the metal so the lifter bore is round again.
I don't think the lifter bores get much wear, I think the holes get out of round after many years of the block heat cycling?
If the lifter bore are lightly rusted or the main oil galley enlarged, after using the burnishing ball, do a light hone of the lifter bore with a small hone like used on wheel cylinders to make sure the bore is smooth (and round.) I don't know if you can still buy oversized lifters for a badly worn lifter bore, but they can be sleeved if needed.