There seems to be some issues with guix refresh -l and/or deprecating
packages.

Take the following example, guile3.0-squee is used by the
guix-data-service. guix refresh -l claims it's not though.

→ ./pre-inst-env guix refresh -l guile-squee
No dependents other than itself: guile-squee@0-2.c1497a2

→ ./pre-inst-env guix refresh -l guile3.0-squee
guix refresh: package 'guile3.0-squee' has been superseded by 'guile-squee'
No dependents other than itself: guile-squee@0-2.c1497a2