alt Hacker NewsWikipedia says it's been Iranian/Omani territorial waters for quite a while:
> 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.
Wikipedia does not say that the Strait is Iranian/Omani territorial waters. Wikipedia says that Iran and Oman claim that the Strait is Iranian/Omani territorial waters.
Claiming it does not make it so.