en.wikipedia.org/wiki/Censorship_in_Japan#Pornographic_censorship

GHQ/SCAP did issue the October 4, 1945 Civil Liberties Directive ordering Japan to abolish laws that restricted freedom of thought, assembly, and speech. But that did not mean censorship ended altogether.

Just weeks earlier, on September 19, 1945, SCAP issued the Press Code for Japan, which explicitly restricted what could be published. The code said, among other things, that there could be “no false or destructive criticism of the Allied Powers” and “no destructive criticism of the Allied Forces of Occupation.” So the occupation authorities abolished Japan’s old wartime censorship apparatus while simultaneously enforcing a new occupation censorship regime.

The National Diet Library’s glossary describes the October 4 directive as abolishing the Japanese government’s systematic repression of freedoms, not as ending all censorship of every kind. That is why the article’s absolute wording — “abolished all forms of censorship” — is inaccurate.