This file is indexed.

/usr/share/bash-completion/completions/debian-goodies.pkgnames is in debian-goodies 0.69.1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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_pkg_names()
{
    local cur prev opts
    COMPREPLY=()
    cur="${COMP_WORDS[COMP_CWORD]}"

    COMPREPLY=( $( apt-cache pkgnames $cur 2> /dev/null ) )

    return 0
}

complete -F _pkg_names which-pkg-broke dhomepage debget