Keywords and Self credits

I noticed that the explanation of "reenactment" and "non-fiction" has been removed from the keyword guide: https://help.imdb.com/article/contribution/titles/keywords/GXQ22G5Y72TH8MJ5?ref_=helpms_helpart_inline#special Under "tv-special" it says, "Also acts like the non-fiction keyword," but there is no explanation of how the non-fiction keyword acts. Meanwhile it still appears that the non-fiction keyword has the same effect of placing a title's cast credits under Self. A separate help page which explained Self credits has also been removed: https://help.imdb.com/article/contribution/filmography-credits/why-do-some-acting-credits-show-up-in-a-separate-list-under-a-category-called-self-even-if-those-people-didn-t-actually-appear-as-themselves/G5H28P735WRDPSKN?ref_=helpart_nav_53 It seems to me that there is still a need for information about these keywords. And the question, "Why do some acting credits show up in a separate list under a category called 'Self' even if those people didn't actually appear as themselves?", is still relevant, and the answer is still in some cases about a genre or keyword.