
This isn’t really an “own”. It’s pretty logical for the foreign-owned hotels in Cuba to have access to diesel for generators, and US citizens are required by law to stay at those foreign-owned hotels instead of ones owned by the Cuban government. So of course they have power when the electrical grid fails
Foreign diseases? Cuba isn’t entirely walled off. You probably have a better chance of picking up an infectious disease there compared to staying in the US (unless you’re around one of the groups known for a low vaccination rate against measles etc). Would be interesting to see the local resource consumption though