The author needs to learn the difference between a blockade and an embargo. Cuba hasn’t been under blockade since the end of the missile crisis.
An embargo would imply its just America that can’t trade with Cuba. In reality, almost nobody can trade with Cuba, because any ship that does cannot enter American ports to trade with America.
It may not be a blockade by the dictionary definition, but it’s certainly not just an embargo.
It’s very much a blockade in practice since it prevents the vast majority of companies of any country from trading with Cuba.
There are very few companies that would survive competition by sacrificing trade with the nearby US to trade with Cuba instead the way the “embargo” forces them to.
That’s an embargo.
A blockade is military stopping traffic. “Effectively a blockade” is an embargo.