G4PhotonEvaporation and G4DeexPrecoParameters

My understanding is that the G4PhotonEvaporation class handles the nuclear deexcitation (Hauf, et al., Radioactive Decays in Geant4, IEEE Transactions on Nuclear Science 60(4), 2013). However, in the rdecay01 example (/extended/radioactivedecay), the G4DeexPrecoParameters class is used, which I guess is what the manual also suggests to use (no mention about G4PhotonEvaporation):

“Options are available for steering of the pre-compound model and the de-excitation module. These options may be invoked by the new C++ interface class G4DeexPrecoParameters.”

Could anyone please tell how G4PhotonEvaporation and G4DeexPrecoParameters are related?