> Old Reddit is posts from before something like 2009

No, it works for the entire post database. If you have a login and go to the main old.reddit.com page you'll see current posts.

Edit: Er, that's how it used to be. Looks like it just redirects to the main domain now. RIP.

Still works for me (although I always use it logged in). If they kill old.reddit, I may finally abandon the site. It's been slowly losing value for a long time and being forced to use the hot garbage of the new UI might be my tipping point.