I perfectly agree with you that a "simplified approach" to Cirkut shooting is more challenging and rewarding, but the availability of that program is anyway a real improvement in knowledge and usability of that camera. I suggest that any passionate about Cirkut should store that program in his PC.
True, unfortunately, also for webpages. In a digital world everything can be "volatile" and fade in an "error 404" (whereas BW negatives 100 yrs old are still here...), due to a decision by a website host or by the author . I "print" them also as PDF files, making also backup copies in a different HD.There is a lesson in the disappearance of that mailinglist. Whenever I see something online I consider really valuable information (such as anything related to Cirkuts), I always print out a paper copy and file it. i don't think there is any guarantee any internet forum or mailinglist will be online forever.