Fuel Exhaustion caused the crash.
What was he thinking about while he flew the machine out of fuel?
After the fuel low warning lights came on....what was he doing/thinking?
Your points about the lack of adequate EOL training in the particular aircraft Type is valid but that weakness could have been avoided had he just landed the helicopter next to a road somewhere and called for a fuel bowser.
Judgement cannot be taught....and he certainly showed a huge lack of that as demonstrated by running out of fuel.
After that happened....the rest was just icing on the cake.
Matter of fact....what was the Med Crew doing all this time?