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Yes; adding an electrolytic cap there and a resistor underneath the board is the swing mod for this radio.

Just reverse what this page shows:

Cobra 29 LTD super modulation modification


EDIT:


After re-reading the RFX instruction sheet myself, you are quite right! 

For this radio installation, they tell you to put a swing mod in. 


My mistake.  After reading all of the other RFX instruction sheets for other radio models - they all said to take any swing mod out.  But for this radio, they want you to put one in.  You had it right in the first place!