They do it but the changes can sometimes be somewhat cryptic. I'm betting that change was listed on the record of revisions as "preflight" and if you go to the affected page you can see a change bar in the margin showing where on the page the change occurred but it's sometimes hard to identify specifically what changed.

If you don't know current book like the back of your hand, good luck identifying a change.

In the 900 they removed the requirement for a paper ODH in one of the revisions and I didn't know until I got a plane that didn't have any paper ODH's and looked it up. The record of revision was "preflight docs" and ODH was deleted.