I just noticed this as well. The domain is registered until 2027, so it's not that.
I can say, first hand, that even TREK sends people there fairly regularly, as I've worked with Trek support on tracking down bike vintages or special release bikes. So, it is, absolutely, an important site for those of us who like the elder products of Waterloo!
I tried to reach out to the owner of the site. Sadly, the form only allows you to say that you want to chat, it doesn't let you send any sort of message. Here's hoping. I'd gladly toss some pennies into a hat to keep the site alive. I'm sure I'm not alone!
--anthony