gpg-remailer explicitly does not want to be a mailinglist, so it differentiates in multiple features (no mgmt of subscriptions of a list over list commands) nor does it have features like remailing capabilities.

schleuder is not a replacement for GNU Mailman, it does not contain all the features of GNU Mailman, while adding certain other features (e.g. remailing) that are not part of GNU Mailman.

GNU Mailman most certainly does remailing; something that doesn't do remailing can't be called a mailing list manager!

It not only re-sends a message to list subscribers, but manipulates the headers and bodies. It can optionally add footers to bodies and alter Subject: lines.

It just won't decrypt messages with its own GPG key and then re-encrypt them for the recipients; it doesn't do "crypto remailing".

Please have a look at https://schleuder.nadir.org/docs/#an-email-hub-for-groups about the context here of remailing.

So correctly it should have been called resending.