Geirha75,
The approach is an LNAV only approach (as you can see on the chart), but that does not necessarily mean that VNAV cannot be used to fly it. The difference between LNAV/VNAV and LNAV Only is that the lnav/vnav will generally have lower minimas, and vnav must be used.
LNAV only does not prohibit the use of vnav (if it will comply with all parts of the approach), it simply does not require it, or offer the lower minima associated with it.
Certainly most of the GNSS approaches done down in this part of the world are LNAV Only, but they are still coded in the FMC database to allow VNAV to operate correctly.
So, the answer is yes, this would be flown as a constant descent - either using V/S as you suggest, or in VNAV if the approach was coded correctly in the FMC (which it most likely is).