I don’t really get that. They’re touch capacitive knobs, so they propose less variations than what MPE is capable of. For example, velocity is not registered at all. (I’m assuming the internal engine uses the amount of change over time as velocity)
Location of your finger on the buttons is not registered so that removes x and y values of MPE.
So the only thing I can think of that could be different is the values of “touch amount” being greater than the MIDI 128 values.
Pitch changes on the device look like just “on/off” values.