But how? Iran is right next door. They can target any mode of getting oil out of there. Not just the strait of Hormuz but any pipelines that lead away from the region can just as easily be targeted. One Shahed to the pipeline is all it would take.
Pipelines have endless vulnerability surface as Ukraine showed and just do the math on trucks vs a super tanker.
That's because the US chose to shoot them down with Patriot missles, like morons. Ukrainians have developed cheap interceptor drones for this very purpose.
There are also radar-guided anti-aircraft guns like this: https://en.wikipedia.org/wiki/Flakpanzer_Gepard