Overview page: https://www.gog.com/en/anniversary
Direct sign up for Galaxy Linux beta: https://www.smartsurvey.co.uk/t/YEF5EV/
And yes, he is running Linux on it ;)
It's literally right there.
Edit: The article needs to be dug out of the waybackmachine: https://web.archive.org/web/20050309174306/http://www.zdnet.com.au/news/0,39023165,39183867,00.htm
Torvald's response came quickly and succinctly. "My main machine these days is a dual 2GHz G5 (aka PowerPC 970) - it's physically a regular Apple Mac, although it obviously only runs Linux, so I don't think you can call it a Mac any more ;)" he said.