He did have some editorial input on what was originally published, but he didn't re-write anything.

Anne had decided that when the war was over she would publish a book based on her diary. So she began re-writing and editing and improving the text, deleting stuff she didn't think was interesting enough and adding stuff from memory. The original diary was still kept though.

After the war her dad was given back the diaries, and he decided to fulfil her wish and have them published. However, at the time it was taboo to discuss sex related topics, and Anne had expressed sexual intrigue and impulses, so originally he omitted those parts, as well as stuff he didn't like about himself and his wife.

When her dad died in 1980 he willed all versions to the Netherlands Institute of War Documentation. And being aware that the diary had been challenged over the years, done a thorough investigation and essentially published the entire correct text.