it should probably link to this: https://mullvad.net/en/blog/exit-ip-fingerprinting-between-v...
which is the blog post, rather than a list of exit servers
related to this post: https://news.ycombinator.com/item?id=48143880
The post you preferred was submitted before. And had not much new information. The rollout was the news. The link was correct.
That blog post is a perfect example of when RFC5737 should be used.
https://datatracker.ietf.org/doc/rfc5737/