Just tried out my custom URL and it still works for me. Site is accessible as normal. The app also works just fine as well.
The login site is down, but the Tor site should still be accessible, so all one would have to do is just go there, generate a unique URL, and then use that on their normal browser. Or better yet, just use Anna's Archive, which isn't prone to getting taken down like this and was specifically made to replace Zlib.