I think it might just be that their documentation is dispersed, and sometimes hard to find. I haven't used the CI, so I can't comment on how well it works, but it appears to be in use: https://blog.liw.fi/posts/2026/radicle-status-quo-07/
Here's some docs on it: https://radicle-ci-broker.liw.fi/userguide.html https://radicle.network/nodes/radicle.liw.fi/rad%3AzwTxygwuz5LDGBq255RA2CbNGrz8