"wikidump" links to https://dumps.wikimedia.org/enwiki/latest/ , which has thousands of files, none of which are 5GB and make sense. That's a very poor corpus link!
It says "Feb 7, 2019", so it probably means https://dumps.wikimedia.org/enwiki/20190120/ or https://dumps.wikimedia.org/enwiki/20190201/ ... maybe. They don't have any obvious 5.3GB files.