Content from 2001 would have been in Flash v5 at the latest - more likely v4, and AFAIK are both pretty fully supported by modern emulators. As such, it sounds

Content from 2001 would have been in Flash v5 at the latest - more likely v4, and AFAIK are both pretty fully supported by modern emulators. As such, it sounds like the "lost" content the article discusses is lost in the sense that nobody is preserving it, not in the sense that something is preventing it from being preserved.