Im not sure what this link is for? The historical membership is listed here https://docs.fedoraproject.org/en-US/council/history/

It's from this section: "A six month release schedule also follows the precedence of Red Hat Linux (precursor to Fedora). Former Red Hat software engineer Havoc Pennington offers a historical perspective." The "historical perspective" part has the hyperlink. Viewing the page in the Wayback Machine, it seems to be Havoc's account on the release schedule cadence instead of historical membership, which fits that section as a whole.

Ugh, nothing that should be easy ever is :( So after asking around, that mail server was decommissioned internally in Red Hat a few years ago. I will try to get that archived email active again, or get access to it to even make a copy and link it to my fedorapeople account or something to preserve the history if I can, but that might take some time. I hope its salvageable, I would hate to have to remove the link and thus the access to the perspective from the docs so that is a last resort. Thanks for flagging this to me!

Building on audioence2142's idea with the wayback machine: Why not just point the link there?
https://web.archive.org/web/20240607150548/https://listman.redhat.com/archives/fedora-advisory-board/2006-December/002039.html

I believe the wayback machine is commonly used as a source for otherwise lost content, I'd say it is good enough to just change the link to this snapshot.

I didnt even know this link existed, thank you! I will update the broken link with that now.

Done now, the website should rebuild in the next few hours with a working link. Thanks for your help!