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There are some other rules on that query for whatever reason never got disclosed. The description in the guide is not exactly accurate.
We provide amnesty on recent posts which give you unlimited editing capabilities on posts that were just created. Anything posted today or yesterday is exempt from the editing rate limits (today and yesterday are defined by ...
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I also think that the current rule is not ideal and I have a simple suggestion that, in my opinion, will avoid all problems:
Allow users to edit and undelete self-deleted questions in one action.
This can be communicated in one of two ways (or both combined):
Change the text of the Save edits button to Save edits and undelete. And/or...
When the user ...
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When you attempt to make an edit to one of your own posts, the system will allow it if any of the following things are true:
The number of edits to your own posts you've already made today, which are eligible for the rate limit (see below), is at or below the site's set limit (currently set to 10 across all sites on the network).
You are a diamond moderator....
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Summarizing the comments into an answer:
If you expect the diff to be stored, that is a false assumption: meta.stackexchange.com/a/297037/158100
As the linked answer says:
No, it [the database] does not store diffs. The complete source of each version is simply kept for each revision.
and:
What you see on a page when you're offered a diff view of two ...
Only top voted, non community-wiki answers of a minimum length are eligible
