That page explains is generically for any package which is affected by this. xarchiver is part of a meta package (kicksecure-desktop-applications-xfce). Also not easy to uninstall other applications which such as xchat, keepassxc, vlc and others (dependency of whonix-workstation-packages-recommended-gui).
Please specifically see Debian Packages - Whonix and then follow all links.
Debian packages support only Recommends: or Depends:. There is nothing in the middle. The missing feature is:
Weak-Depends:list of packages that gets installed when usingapt --no-install-recommendsbut any package listed there can be removed without removing the package which referenced theWeak-Depends:
The related forum discussion: