> Ghana doesn't have all of the layers of industry necessary to support development and export of products i.e. there are no market buyers at any reasonable price.
Per the article, they literally control half of the world's cocoa. This means they get to define what "a reasonable price" is, as long as the rest of the world wants to keep its chocolate plentiful.
I'm not a politician or economist - but to me, it seems obvious the plan here is to bootstrap domestic cocoa processing industries, get the current exporters to sell cocoa to domestic producers, and export processed products (like chocolate). They're not going to just stop cultivating cocoa - being in control of half of the supply of raw materials for a highly prized product is their one big leverage on the international market.
As to not having the necessary industry base to pull it off - the question is, how fast can they build one? I'd guess a couple of years, if no foreign powers try to make it hard for them.