What kind of autism would you need to know what you supposedly plagiarized out of 1000+ posts?
Out of years, plagiarism will immediately results in perma ban. It's better if plagiarism can be found within hours, or weeks, but there is nothing wrong if plagiarism found years later. Eventually, plagiarsm findings lead to immediately perma bans. If someday, someone whom created the bot that found plagiarism automatically and caused massive perma bans recent days share this bot to theymos, it's better to stop complaints on perma bans for years-ago mistakes.
Plagiarism: If you copy some text from somewhere, then you should have a good reason for it, and you must link to the source. Doing otherwise is plagiarism. Changing a few words around doesn't matter. If we find that you plagiarized, then you absolutely will be permanently banned, even if we find it years after you did it.