Doesn't A33Zab say that in Alt2 it is replaced by Ny without correction?
Indeed!,and IMO the Ny in ALT2 (Yaw = ALTERNATE YAW LAW) is used for indication of the PFD sideslip indication. (+/- 0.3g max).
The rudder deflection in ALT2 (ALTERNATE YAW) is only a function of pedal and/or Yaw damper input. (based upon the yaw rate).
In ALT2 Yaw damper has a limited authority of +/- 4 degrees in CONFIG 0 (=CLEAN)