Why the quotes around doctor? Cuba has some of the best health outcomes in the LatAm (and arguably the world), it seems like their doctors are of a higher quality than most.
Also, assuming we have perfect faith in Chinese government statistics and Cuban government statistics...
Nevertheless, the wild variations in Covid experiences between countries and controversy over why it happened, make me think it is a useless yardstick.
I think nothing. Cuban is an authoritarian government that uses it's healthcare for propaganda. It has all the incentives to lie and AFAIK none of these claims are verified by independent parties parties. Regardless of political system it's a poor embargoed island and it's easier to believe that they are gaming the metrics than really providing better health outcomes.