To a certain extent, yes polishing would fill in the microscopic pores in the surface of the ball. That's why you have to sand a ball to remove polish and open the pores back up sometimes.
But that is the point of polishing! Your adjusting the balls surface, to make it go farther down the lane before it reacts.
By polishing your filling in ridges and/or wearing them down (depending on type of polish) to reduce friction and filling in pores to slow the oil absorption, so the oil sits on the outside of the ball. Which would reduce the amount of friction even more.
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