Is RTF used while defrost power calculation in DX:Heating:Coil component?

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In the EnergyPlus Engineering Reference (pg 909), the reverse-cycle defrost power is given as as function of both fractional defrost time and Runtime-fraction (RTF)

However, in the current source code (DXCoils.cc, (https://github.com/NREL/EnergyPlus/bl...) around lines 8391–8403 in commit 4052950), the defrost power for reverse-cycle on-demand defrost is implemented as:

FractionalDefrostTime = 1.0 / ( 1.0 + 0.01446 / OutdoorCoildw );
...
DXCoil(DXCoilNum).DefrostPower =
  DefrostEIRTempModFac *
  ( DXCoil(DXCoilNum).RatedTotCap(Mode) / 1.01667) *
  FractionalDefrostTime;

i.e., it multiplies by FractionalDefrostTime but not by RTF.

Which formulation is intended to be correct: the Engineering Reference equation including RTF, or the current implementation without RTF? If the code is correct, how should the Engineering Reference equation be interpreted?