You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.

opendp
0.10.0a20240805001

This version was deleted from PyPI around 2024-10-09. Installing fails with:
$ pip3 install opendp==0.10.0a20240805001 ERROR: Could not find a version that satisfies the requirement opendp==0.10.0a20240805001