The tag is present in Lintian version 2.104.244. That is the most recent version we know about.
The implementation of the "Debian Maintainers" GR has changed and the "DM-Upload-Allowed" field is now obsolete.
Instead these permissions are granted via "dak-commands" files.
Refer to https://lists.debian.org/debian-devel-announce/2012/09/msg00008.html for details.