I believe those are for the cables that route internally around the BB. They say for SL4 models in the advertisement. And SL4 frames had the cable running fully internal in the downtube.

The OP's bike appears to be an SL2 model frame. There are pics of SL3 frames and SL4 frames that have the cables enter the downtube just behind the headtube. However it's still reasonable that the OP's bike might have been a SL2 frame that they sold as a low tier component version even when the SL4 frames were debuted with the top tier components. Specialized does the same thing today. Lower tier components get put on the previous model frames and the highest tier components are put on the latest and greatest S-Works frame.