Circling minima are not runway specific. Just occasionally they can be sector specific but it is very rare. Both PANSOPS and TERPS CMs are derived from an area constructed AROUND THE RUNWAYS and since while circling you effectively fly through the 'R06' area and the 'R24 area' and any other runway area................he is wildly wrong However, as you say, since the CM for 06 and 24 will be exactly the same, why not just say "Yes Captain" and use the value printed?