I submitted the above link, seems HN is rewriting it automatically. :-/
The site still works if 1) you are logged in or 2) you're in the control of the A/B test group (presuming the A/B test is still ongoing).
I've been unable to access old.reddit.com for over a week now. Site's dead to me.
I think they've been slow rolling it, eventually it will be login only.