Blockades usually refer to impeding a country to trade with anybody. Tariffs are only comparable if you consider the US tariffs to be an act of war against the US.
(Having said that, it's not such a ridiculous concept as it seemed.)
A second in command of the US military, Jim Mattis, during Trump's first term said:
“Donald Trump is the first president in my lifetime who does not try to unite the American people—does not even pretend to try. Instead, he tries to divide us,” Mattis writes. “We are witnessing the consequences of three years of this deliberate effort... I swore an oath to support and defend the Constitution. Never did I dream that troops taking that same oath would be ordered under any circumstance to violate the Constitutional rights of their fellow citizens—much less to provide a bizarre photo op for the elected commander-in-chief, with military leadership standing alongside.
If you are ideologically in the group that he used the military against on American soil, or you are in the half of the divided country that he doesn't see as his supporters, then the concept is even less ridiculous sounding, cogent even. He's effectively taken a government that represents a whole country and turned it into a government that only represents half of the country. When you realize that all he supports are American oligarchs who are international in nature the comparison starts to get more and more and more cogent.
These are two of the complaints of America's founding fathers against King George III written in the declaration of independence.
"For cutting off our Trade with all parts of the world:"
"For imposing Taxes on us without our Consent:"
The British government was the founding father's government.
As far a "acts of war" against their own citizens: Israel is Gaza's government and that blockade is so strong it is called an open air prison. Russia is fighting to be Ukraine's government. China is Hong Kong, Tibet, and Xinjiang's government.
In an authoritarian's government, it is not your government, it is only their government. Authoritarianism is in many ways a state of persistent war against people, which intuitively makes sense, because war is how you resolve disputes when negotiation doesn't work. War is the state of power alone resolving disputes, which is also what authoritarianism is.
While you are lecturing me on words meanings, I would advise you to look up the meaning of "de facto."
If you were America's founding fathers and King George 3, the leader of their government, decided to put a 10000% tariff on goods meant for the colonies, do you think they would have felt blockaded?
How expensive does a tariff have to be before it is a de facto blockade?
I think that comparison is much more apt than it first appears.