/usr/share/doc/libbpp-phyl-dev/changelog.Debian.gz is in libbpp-phyl-dev 2.1.0-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libbpp-phyl-dev/../libbpp-phyl9/changelog.Debian.gz
/usr/share/doc/libbpp-phyl-dev/../libbpp-phyl9/changelog.Debian.gz