I did read the original post in Chinese, though not this post in English. Unfortunately beyond the claim "search engines show up zero results" the other claims like 99.99% pages disappearing doesn't fully match my experience. I have lots of threads between 2000~2010 on Baidu Tieba (Chinese Reddit), and most of these threads representative of my memories from that decade are alive (I can even access them anonymously). The earliest video on bilibili.com still available is av7 (7th video since its creation). While some websites like RenRen did disappear together with its history, most websites that remain relevant didn't delete its history in its entirety (lots of content did disappear because of modern moderation applied retroactively to old content, but that's case by case).