In west africa, people hardly consume any drugs at all, even the most hardened criminals stop at indian hemp.
Guinea is not a country ravaged by drug war at all, precisly becuase there is no effective police force, and the drugs are not consumed locally.
The people just fly in with their planes, do the transfer of drugs, and fly out. It's actually pretty peaceful.
If there is a problem that Africa does NOT have, it's drugs. Africans transport drugs, but they don't consume them, and as a result, there is very little drug related conflict in Africa.
The solution to what is described in the article is not to build armies on the islands of Guinea, but to simply increase security into Europe. The european market disappears, and the south americans will stop transporting through Africa.