I have a simple question, if I mistakenly post data such as my personal address, private key or any data that I later want to hide, and I contact @ and he delete it, will both sites comply with this deletion?
Well that's a fair question but let's suppose they both agree to delete ninjastic.space and loyce.club, How about other places? For example web.archive.org I don't think they will honor such requests.
Your statement has some inaccuracy, for website/crawler/archive service under legal company/organization have some legal obligation to honor data removal. For example, archive.org provide guide for removal/exclusion[1] while archive.today have button "report bug or abuse"[2]. They might honor your request, but it'll take some time/effort on your side.