"Banana republic" is just a term people use to mean a state run by thieves that only pay lip-service to the rule of law. Nobody uses the term to disparage south American countries. I'd wager that most people don't even know the real background of the term. People who have played Tropico know, of course.
The article you cited also seems to ignore that social media have frequently compared Trump to European dictators. Thanks to crafty wordsmiths, we now have terms like Cinnamon Hitler and Cheeto Benito.
If we're talking about more established media, comparisons like that are simply taboo. People elsewhere do not share our taboos, or our sensitivities to WW2 related issues. Likewise it's natural that we are not as sensitive regarding the black pages of far off places, either.
That is why comedians and pundits feel comfortable comparing Trump to African dictators or south American strongmen, rather than Hitler or Mussolini. Not some colonial mindset.
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