Hi Hedski
CAT.OP.MPA.115 Approach flight technique - aeroplanes
States that CDFA technique shall be used for all non-precision approaches (with some caveats); however, this only applies to commercial air transport in aeroplanes. I have never come across any similar requirement for helicopters or non-CAT aeroplanes. It may be that the ATO saw the above sentence but missed the paragraph heading.
Hope that helps.
TeeS