The tag is present in Lintian version 2.109.6. That is the most recent version we know about.
The data tarball of this udeb package is not compressed in format that udpkg (debian-installer's dpkg equivalent) does not support. Thus the udeb is likely to be uninstallable and could break daily or weekly d-i images.
Currently, udpkg supports .gz and .xz compressed tarballs.