Part of the problem with any investigation into this crash is that the crash occurred on the 7th of January 1933 and the wreckage was not found until April of that year.
His body had significant head injuries but the suggestion is that he walked some distance from the wreckage and lay on the ground where he was later found.
There is no real way of knowing whether the injuries sustained in the crash were survivable.
A sad and lonely end to a truly great Aviator.