The warning they added upon my initiative. I suggested to keep the repository up for posterity. Who knows who's using the library and with the repo disappearing, they might just wonder why it's gone.
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:
Discussion
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