i think they mean a normal archive of physical materials. archivist have been working with collections like these long before the internet archive existed.
according to the archivists i know, they are cowboys who don't listen to the advice or follow the historic practices of archivists. For example, you should ask permission before you archive something. You have the right to be forgotten, and archive.org scoffs at that premise by ingesting and serving the whole historic web without permission from the owners.