That the output voltage of the DAD6001 adapter varies with input voltage. As phantom power voltage into the adapter is reduced, the stepped-down output voltage to the microphone is also reduced. And as the mic's supply voltage is reduced, self-noise increases and max SPL is decreased.
One would need to measure the actual output voltage of the DAD6001 adapter under those varying input phantom voltages to determine what actual mic power voltages correspond to the figures in the table. Too bad they don't list that in another row along the bottom of the table, as it would apply to any powering scheme for the microphone and not just the DAD6001.