What is the output voltage and current necessary to operate the MEMS mirror?
They do give a bias voltage of 90v and the difference voltage implying that the two electrodes in each axis are relative to that bias voltage. So you will need two single-ended drivers per axis.

Assuming that is true your driver will need to provide about 0-180V for each axis.

The current required for electrostatic actuators is essentially zero and they act as a pure capacitive load. I would expect the actuator capacitance to be very low and dominated by the package and connections to the driver.

I designed a system with similar mirrors with >750 in one unit requiring ~3,000 drivers. In that case, the interconnect capacitance was hundreds of picofarads. But I only used 15uA in the output stage of each driver to keep total power consumption low.