That is because, with respect to the material used, sake is also produced from general-purpose rice that isn't classified in jozoyo genmai (literally, unpolished rice for brewing), or, in other words, a variety that is classified by the Agricultural Products Standards Rule in suito uruchi genmai (literally, unpolished paddy non-glutinous rice).
なぜなら日本酒の原料として、醸造用玄米に分類されない一般米、すなわち農産物規格規程で水稲うるち玄米に分類される品種からも日本酒は造られているからである。