> In 1959, Iran altered the legal status of the strait by expanding its territorial sea to 12 nmi (22 km) and declaring it would recognize only transit by innocent passage through the newly expanded area. In 1972, Oman also expanded its territorial sea to 12 nmi (22 km) by decree. Thus, by 1972, the Strait of Hormuz was completely "closed" by the combined territorial waters of Iran and Oman.
Claiming it does not make it so.
However, I believe Oman also collects fees. So in practice the distinction wrt shipping is moot
> Ok, so just de facto iranian.
No, the route is entirely outside of Iranian waters. They attacked ships that were in Oman waters and put mines in Oman waters and now shoot at anyone trying to removing those mines in Oman waters. Nobody, not even the Iranian government, claims that is their water.