I just managed to post a message to it, using the link above.

I had to ignore a warning about invalid security certificates. Makes sense that if the registration had lapsed, so would the security certification. In any event I used a low-security password for the site that I don't use for anything serious, so I wasn't risking anything even if the site had been spoofed.

The site was last crawled by the archive.org Wayback Machine on 16 February, so everything posted before then should be recoverable.