Shooting down people involved in accidents or incidents seems to have become the favorite passtime here.
If you know a bit the place you wil find that both airports are at sea level, the whole route is above sea. For a roughly 50 NM leg going easbound, FL90 is a good and correct level . No high MSA in there.
How about this ( speculation )
You take off , take course 060 and find a CB in the middle of the route, you are 3 in the cockpit , you look at the Wx radar , discuss it, and decide to go left. How long you wander left and why unoticed for so long is most probably the issue.
Because when you are clear of the Wx and decide to turn right back to DLA , bingo the EGPWS wakes you up and you find out there is Mt Cameroon in between.
Now a bit of pontification to the Non-pros here :
Because you are profesional you make a report of this to avoid others to make a similar mistake, and your airline, passes it on to the Investigation Board, which, because it is professional organisation publishes it so that other operators can learn from this and avoid it too.
Another possible scenario, Eastern 401 L-1011 in Everglades .
Every professional will read the report in a few months and the system will probably be a little safer as whole.
Throwing stones at people/airlines /countries will set us back 40 years, where nothing "embarassing" was ever reported.
So keep it cool guys, it is good to have reports like this.