I see no reason to believe this.
It is a common belief among Americans.
Cuba has definitely pretended to provide great healthcare and be at the top of the field in medicine and biotechnology.
But, Cuba is a closed society without free press or free speech.
Claims made under such circumstances are under no obligation to be believed or accepted, and in fact the opposite is true.
When a government maintains an closed society without free speech and press it is hiding things and any claim they made should be met with skepticism and a very high burden of proof.
Why do Cubans live as long as Americans?
It’s the same reason Cuba claims a higher live birth rate than Americans...
THEY DON’T COUNT THEIR ABORTIONS.
Why do Cubans live as long as Americans?
They don’t count murder/suicide/disappeared persons/firing squad deaths in their stats.