While I agree with your analysis, would you think is the best to use the same generic term "colonialism" for both the situations in French Guyana and let's say Venezuela in the last year? I would prefer more words to differentiate a bit, but maybe that's just me.
How does it compare to Alaska? Wasn't it purchased as a colony from russians to exploit Alaskan gold with complete disreagrd for opinion of the native population?