Thanks for bringing this up. Someone brought your note to the attention of Monero IRC group and they removed it. Agreed with you it should have been taken down a long time ago. The original also added a warning to it a few days ago.
Removed:
https://github.com/monero-project/urs
Warning added:

GitHub
GitHub - meling/urs: Unique Ring Signatures to sign messages anonymously
Unique Ring Signatures to sign messages anonymously - meling/urs