The DEMO version only includes 4 pages:
http://thatgamesguy.co.uk
http://thatgamesguy.co.uk/game-engine-dev.html
http://thatgamesguy.co.uk/assets.html
http://thatgamesguy.co.uk/cpp-game-dev-0.html

It is possible to download these free files and install them on your server, so you can test how the site works.
Visit https://www.waybackmachinedownloader.com/en/buy-wayback-machine-downloader-recover/ to buy a fully functioning site.
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