Being an RNP RF (P-RNAV) approach, is it not a precision approach rather than a non-precision approach?
Usually an RNAV GNSS/RNP approach is a NPA, but I know there are other RNAV approaches out there (RNP AR and LPV for example) which have much lower minima, which perhaps are precision.
If so, that would explain why FDs on.