And the components no doubt are already hardened/shielded to the maximum extent practical. It would be feasible to implement the robot mechanical functions using hydraulics, but the sensors and cameras are another matter. That unprecedented level of radiation (within the scope of man’s activities) is going to do funky things to a broad range of materials: solid, liquid, and gaseous.
Radiation shielding is capture cross section & shielding thickness. I am sure as you pointed out the robot is probably already at edge of what can be done to protect it.