As of a few minutes ago old.reddit.com now seems to requre logging in to access it.
Shame as it was still the best place to browse for info about some niche interests.
Edit: Seems like they might be testing the change as it is hit or miss at the moment.
Edit: Adding this to My flilters in uBlock Origin seems to fix the issue for the time being:
||reddit.com^$header=referer:
Redlib is great but has not seen a new release in over a year, the maintainer who took over the Libreddit project is clearly burnt out.
Suggest following this GitHub issue as folks have created forks of Redlib.