The package is severely out of date with respect to the Debian
Policy. Latest version is 4.7.0
and your package only follows
3.9.8...
This package is neither part of unstable nor experimental. This
probably means that the package has been removed (or
has been renamed). Thus the information here is of little interest ...
the package is going to disappear unless someone takes it over and
reintroduces it into unstable.
There were override disparities found in suite unstable:
Migration status for amd64-microcode (3.20230414.1 to 3.20230719.1): Waiting for test results or another package, or too young (no action required now - check later)