I'm a bit confused by the table as well especially looking at the LX-7, which has at least 20% more focal length than the LX100. I suspect 32mm is doable since the Subsee+10 is giving about 4.5cm. So may be the CMC-1 is closer to +15, which is stronger than the SMC.
For diopters what matters is the optical focal length, not the 35mm equivalent value. With the LX100 having a larger sensor perhaps it has a longer optical focal length than the LX-7, which would make the diopter work more effectively. I am more puzzled by the fact that they increase magnification while at the same time increasing working distance. It is hard to imagine how that would work for a diopter, or any other type of solution that I know of.