Ok well, technically I guess it is a large diaphragm mic, because large diaphragm means the diaphragm is at least as big is the highest wavelength that is supposed to reproduce. At 20khz, the wavelength is usually around 0.68 inches. So if a diaphragm is bigger than 0.68 inches, it IS large.
The Shure KSM32/sl has a 0.75 inch diaphragm, which technically is large, though would not normally be considered large diaphragm, and would fit mroe into the small diaphragm category. Then, they "embossed" a pattern into the diaphragm, which would help give it some of the characteristics of larger diaphragm mics, in addition to the flatter, and higher frequency frequency response of the smaller diaphragm.
-Tyler