As I wrote, just a few days when I posted that exact link:
There is a strong US lobby (certain GOM operators, their trade bodies, Bell and the less progressive oil companies) that are happy that cheap, low power, single engine helicopters (mostly 206s) fly two thirds of GOM flight hours and sectors. They will always use the weak US definitions of accidents to make their rates look better.
The big difference is that aircraft that ditch in the GOM are not counted as having had an accident as though sinking is a normal part of a flight!