It is true that the survivor's account is consistent with a CFIT with no warning. The witness does not recall any abrupt maneuvering, any power setting changes, any stall warning horn, etc.. The problem is that the witness did suffer a brief loss of consciousness and therefore may not be as reliable as analysis of the technical evidence will later prove to be.
I've noted considerable discussion of the boldness of bush pilots but how "excessively bold" could the pilot have been if he was flying a known GPS course he had flown dozens of times before? And how much boldness is involved if he took off in the same weather conditions that other nearby pilots were flying in? The wreckage was spotted by a pilot already in the air and not on a SAR mission. How bold was that pilot?
Sure we will probably never know the exact weather conditions at time of take off, there being no reliable reporting station at that location, but the plane does appear to have been on its proper course and in its intended location. It was just too low.
I hope the interim report comes along soon. This one will prove interesting.