It is effectively an oil blockade, and it's illegal under international law. Being this pedantic about how the US justifies its actions shows zero understanding for how these things tend to be done. The purpose of a system is what it does.
A blockade is an act of war where a country physically stops vessels from entering port in the target of the blockade. There is no choice in a blockade, the country enforcing the blockade is acting unilaterally
If you really think this is a distinction without a difference, then you could've just used the word "embargo" and avoided this exchange. But you didn't, you chose to call it a blockade, which is incorrect.
Pretending that what the US does here is the same as if any other country did it is disengenuous.
It's an effective blockade.
If you think the embargo is bad, that's fine. What I'm objecting to is people calling it a blockade.