The two core factual predicates in Tapper's statement are confirmed by multiple independent Tier 1 and Tier 4 sources. First, Iran's Foreign Minister Araghchi did announce on the morning of April 17 that the Strait of Hormuz was 'declared completely open' for all commercial vessels, explicitly linking it to the Israel-Lebanon ceasefire . Second, a US-brokered 10-day Israel-Lebanon ceasefire did go into effect the prior day, April 16 . The claim accurately describes what Iran announced and correctly attributes its stated rationale. The identifiable inaccuracy is that Tapper's phrasing — 'reopened the Strait to commercial traffic' — implies an operational fact (the strait functioned as open), when in reality the announcement was immediately contested: IRGC-affiliated media described conditions and required IRGC coordination , ship-tracking data showed tankers turning back rather than transiting , and the IRGC formally re-closed the strait less than 24 hours later on April 18 . The Araghchi announcement was declaratory and fragile, not a confirmed operational reopening at the time of broadcast. Applying the MOSTLY TRUE boundary test (per Section: MOSTLY TRUE requires the core assertion to be substantially correct with an identifiable inaccuracy that does not reverse directional meaning): the directional point — Iran made a significant announcement linked to the Lebanon ceasefire — remains fully accurate. The inaccuracy (treating a contested, conditional declaration as an operational fact) does not reverse that meaning. A reasonable viewer would still conclude that Iran had taken a significant step toward reopening the strait in connection with the ceasefire, which is accurate. Verdict: MOSTLY TRUE.