All reports of missing-debconf-dependency-for-preinst for the archive. The extended description of this tag is:
Packages using debconf in their preinst script must pre-depend on debconf, with appropriate discussion on debian-devel. Since debconf is almost always already installed, this is normally better than depending on it and falling back to a different configuration system.
This tag has not been emitted in any package tested by Lintian.