My experience with the Sperry Helipilot system on Bell 412's and S-76's demonstrated the aircraft could get you down to 50 feet AGL using the RadAlt and the system tracking the Localizer and Glide Slope....and do so at 60 Knots IAS.
On a fully instrumented runway approach system...with all the lights, strobes and such.....NVG's for a SINGLE Pilot Operation would be a benefit and a distraction.
Legal Approach Minima are well above the 50 foot number for ILS Approaches (all depends upon the OpSpecs for the Operator).
Now if you are doing a some sort of off airport approach or a Non-Precision Approach.....I can see a whole new degree of difficulty.
What kind of Instrument Approach was the Pilot performing?
But...back to the tragedy in question....the video of the crashed aircraft raises a lot of questions about what happened.
I did not see any lengthy skid marks or other signs of disturbance to the surrounding sod....all the Rotors were still attached, the aircraft certainly had a very hard vertical impact.....well off the Runway.