en.wikipedia.org/wiki/Akihito

This sentence understates the number of countries Akihito and Michiko visited on official trips after his accession.

The Imperial Household Agency's official biography for Akihito states: "Since the Emperor's enthronement, Their Majesties have so far made official visits to 28 countries". That directly contradicts the article's claim of "eighteen countries."

A separate Imperial Household Agency history page also says that Akihito and Michiko "have visited 57 countries in more than fifty years since their marriage in 1959," while the same official biography says they had already visited 37 countries as Crown Prince and Crown Princess before enthronement. Those official figures are consistent with a post-enthronement total far above 18.

So the article's number is not just outdated phrasing; it is factually incorrect against the Imperial Household Agency's published counts.

The claim says the March 19, 2020 move out of the Imperial Palace was Akihito's first public appearance since his abdication. Contemporary reporting shows that is incorrect.

Nippon TV NEWS 24 JAPAN reported on May 6, 2019 that "Emperor Emeritus Akihito and Empress Emerita Michiko make their first public appearance since his abdication" when they visited a tennis court. Anadolu also reported the same day that the former emperor and empress were photographed at a tennis club in their first public appearance after his abdication.

Because public appearances were already being reported in May 2019, the March 19, 2020 move could not have been the first one after abdication. It was a later appearance.

This sentence describes the legal mechanism incorrectly.

When Akihito's abdication was actually arranged, Japan did not amend the Imperial Household Law itself. Instead, the government and Diet used a special measures / single-use law applicable to Akihito.

The Prime Minister's Office later referred to the governing measure as the "Special Measures Law on the Imperial Household Law" and said the Imperial House Council decided that this law should take effect on April 30, 2019. The Japan Times' contemporaneous report on the Diet's action likewise described it as "a special single-use law" allowing Akihito to abdicate.

So while the Imperial Household Law lacked abdication provisions, the solution was not an amendment to that law as this sentence claims; it was separate special legislation.