Marilyn Manson removing ribs to suck his own dick isn’t even close to the first viral meme. That little guy I posted up there was a viral meme from WWII.
The main point they were making is that the meme is particularly old, pre-dating the modern Internet - the dominant medium of memes. As such, you could certainly say, perhaps somewhat hyperbolically, that it’s one of the first. Not sure why some people expect whatever another writes in an internet comment to be 100%, to-the-letter, literally true, when that’s not at all how we use language from day to day.