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

gdb-for-pwndbg
16.2.0

This version was deleted from PyPI around 2025-06-17. Installing fails with:
$ pip3 install gdb-for-pwndbg==16.2.0 ERROR: Could not find a version that satisfies the requirement gdb-for-pwndbg==16.2.0