I'm not sure I follow. They update the ones they are aware of that need changing, and often comment when they do. The existence of mods commenting and changing some titles doesn't imply that they see all of the ones that need changing. I've read comments by them stating outright that they don't see everything.

Have you seen comments made by them that indicate a change in policy other than those mentioned in the guidelines? Has there been a substantive change in the intent of the guidelines as currently written over time?

https://news.ycombinator.com/newsguidelines.html

Editing is not the same as editorializing.