There aren’t really taken down, just removed from the index after 60 days, see https://github.com/pytorch/builder/blob/2a03668317eae474844f3ae1f31578facf7a1688/s3_management/manage.py#L102-L103
But one can still download the wheel, i.e.
curl -OL https://download.pytorch.org/whl/nightly/cpu/torch-2.1.0.dev20230602%2Bcpu-cp310-cp310-linux_x86_64.whl will get you 2.1.0.dev20230602 wheel for Python-3.10